I found that the project manipulate plugin does not work well.
Here is my setting, see the attachment image.
Project 'Code::Blocks wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'Code::Blocks wx3.2.x (64 bit)', target 'tinyXML': Replaced custom var 'u'.
Project 'Code::Blocks wx3.2.x (64 bit)', target 'AutoRevision': Replaced custom var 'u'.
Project 'Code::Blocks wx3.2.x (64 bit)', target 'ConsoleRunner': Replaced custom var 'u'.
Project 'Code::Blocks wx3.2.x (64 bit)', target 'Squirrel': Replaced custom var 'u'.
Project 'Code::Blocks wx3.2.x (64 bit)', target 'scintilla': Replaced custom var 'u'.
Project 'Code::Blocks wx3.2.x (64 bit)', target 'sdk': Replaced custom var 'u'.
Project 'Code::Blocks wx3.2.x (64 bit)', target 'src': Replaced custom var 'u'.
Project 'Code::Blocks wx3.2.x (64 bit)', target 'Abbreviations': Replaced custom var 'u'.
Project 'Code::Blocks wx3.2.x (64 bit)', target 'AStyle': Replaced custom var 'u'.
Project 'Code::Blocks wx3.2.x (64 bit)', target 'Autosave': Replaced custom var 'u'.
Project 'Code::Blocks wx3.2.x (64 bit)', target 'Compiler depslib': Replaced custom var 'u'.
Project 'Code::Blocks wx3.2.x (64 bit)', target 'Compiler': Replaced custom var 'u'.
Project 'Code::Blocks wx3.2.x (64 bit)', target 'Debugger': Replaced custom var 'u'.
Project 'Code::Blocks wx3.2.x (64 bit)', target 'Code-completion': Replaced custom var 'u'.
Project 'Code::Blocks wx3.2.x (64 bit)', target 'Class wizard': Replaced custom var 'u'.
Project 'Code::Blocks wx3.2.x (64 bit)', target 'Default MIME handler': Replaced custom var 'u'.
Project 'Code::Blocks wx3.2.x (64 bit)', target 'Occurrences Highlighting': Replaced custom var 'u'.
Project 'Code::Blocks wx3.2.x (64 bit)', target 'Open files list': Replaced custom var 'u'.
Project 'Code::Blocks wx3.2.x (64 bit)', target 'Projects-workspaces importer': Replaced custom var 'u'.
Project 'Code::Blocks wx3.2.x (64 bit)', target 'Scripted wizard': Replaced custom var 'u'.
Project 'Code::Blocks wx3.2.x (64 bit)', target 'To-do': Replaced custom var 'u'.
Project 'Code::Blocks wx3.2.x (64 bit)', target 'XP look & feel': Replaced custom var 'u'.
Project 'Addr2LineUI wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'Addr2LineUI wx3.2.x (64 bit)', target 'default': Replaced custom var 'u'.
Project 'Code::Blocks Share Config wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'Code::Blocks Share Config wx3.2.x (64 bit)', target 'default': Replaced custom var 'u'.
Project 'CbLauncher wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'CbLauncher wx3.2.x (64 bit)', target 'default': Replaced custom var 'u'.
Project 'cbp2make wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'cbp2make wx3.2.x (64 bit)', target 'default': Replaced custom var 'u'.
Project 'cbp2make wx3.2.x (64 bit)', target 'Doxygen': Replaced custom var 'u'.
Project 'CC Test wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'CC Test wx3.2.x (64 bit)', target 'cctest': Replaced custom var 'u'.
Project 'wxWidgets - Contrib Items wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'wxWidgets - Contrib Items wx3.2.x (64 bit)', target 'wxFlatNoteBook': Replaced custom var 'u'.
Project 'wxWidgets - Contrib Items wx3.2.x (64 bit)', target 'wxChartCtrl': Replaced custom var 'u'.
Project 'wxWidgets - Contrib Items wx3.2.x (64 bit)', target 'wxCustomButton': Replaced custom var 'u'.
Project 'wxWidgets - Contrib Items wx3.2.x (64 bit)', target 'wxImagePanel': Replaced custom var 'u'.
Project 'wxWidgets - Contrib Items wx3.2.x (64 bit)', target 'wxSpeedButton': Replaced custom var 'u'.
Project 'wxWidgets - Contrib Items wx3.2.x (64 bit)', target 'wxKWIC': Replaced custom var 'u'.
Project 'wxWidgets - Contrib Items wx3.2.x (64 bit)', target 'wxLED': Replaced custom var 'u'.
Project 'wxWidgets - Contrib Items wx3.2.x (64 bit)', target 'wxMathPlot': Replaced custom var 'u'.
Project 'wxSmith wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'wxSmith wx3.2.x (64 bit)', target 'wxSmithLib': Replaced custom var 'u'.
Project 'wxSmith wx3.2.x (64 bit)', target 'wxSmith': Replaced custom var 'u'.
Project 'wxSmith - Contrib Items wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'wxSmith - Contrib Items wx3.2.x (64 bit)', target 'wxSmithContribItems': Replaced custom var 'u'.
Project 'wxSmith - wxAUI wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'wxSmith - wxAUI wx3.2.x (64 bit)', target 'Default': Replaced custom var 'u'.
Project 'headerguard wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'headerguard wx3.2.x (64 bit)', target 'default': Replaced custom var 'u'.
Project 'LogHacker wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'LogHacker wx3.2.x (64 bit)', target 'default': Replaced custom var 'u'.
Project 'ModPoller wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'ModPoller wx3.2.x (64 bit)', target 'default': Replaced custom var 'u'.
Project 'tidycmt wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'tidycmt wx3.2.x (64 bit)', target 'default': Replaced custom var 'u'.
Project 'AutoVersioning wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'AutoVersioning wx3.2.x (64 bit)', target 'default': Replaced custom var 'u'.
Project 'BrowseTracker wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'BrowseTracker wx3.2.x (64 bit)', target 'default': Replaced custom var 'u'.
Project 'Games wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'Games wx3.2.x (64 bit)', target 'default': Replaced custom var 'u'.
Project 'Koders Query wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'Koders Query wx3.2.x (64 bit)', target 'default': Replaced custom var 'u'.
Project 'Cccc wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'Cccc wx3.2.x (64 bit)', target 'default': Replaced custom var 'u'.
Project 'Code Snippets wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'Code Snippets wx3.2.x (64 bit)', target 'Plugin - Win32': Replaced custom var 'u'.
Project 'Code Stat wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'Code Stat wx3.2.x (64 bit)', target 'default': Replaced custom var 'u'.
Project 'CopyStrings wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'CopyStrings wx3.2.x (64 bit)', target 'default': Replaced custom var 'u'.
Project 'CppCheck/Vera++ wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'CppCheck/Vera++ wx3.2.x (64 bit)', target 'default': Replaced custom var 'u'.
Project 'Cscope wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'Cscope wx3.2.x (64 bit)', target 'default': Replaced custom var 'u'.
Project 'DevPak wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'DevPak wx3.2.x (64 bit)', target 'libbz2': Replaced custom var 'u'.
Project 'DevPak wx3.2.x (64 bit)', target 'default': Replaced custom var 'u'.
Project 'DoxyBlocks wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'DoxyBlocks wx3.2.x (64 bit)', target 'default': Replaced custom var 'u'.
Project 'DragScroll wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'DragScroll wx3.2.x (64 bit)', target 'default': Replaced custom var 'u'.
Project 'EditorConfig wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'EditorConfig wx3.2.x (64 bit)', target 'default': Replaced custom var 'u'.
Project 'EditorTweaks wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'EditorTweaks wx3.2.x (64 bit)', target 'default': Replaced custom var 'u'.
Project 'EnvVars wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'EnvVars wx3.2.x (64 bit)', target 'default': Replaced custom var 'u'.
Project 'EnvVars wx3.2.x (64 bit)', target 'no_pch': Replaced custom var 'u'.
Project 'FileManager Plugin wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'FileManager Plugin wx3.2.x (64 bit)', target 'default': Replaced custom var 'u'.
Project 'HeaderFixup wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'HeaderFixup wx3.2.x (64 bit)', target 'default': Replaced custom var 'u'.
Project 'Help wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'Help wx3.2.x (64 bit)', target 'bzip2': Replaced custom var 'u'.
Project 'Help wx3.2.x (64 bit)', target 'zlib': Replaced custom var 'u'.
Project 'Help wx3.2.x (64 bit)', target 'help_plugin': Replaced custom var 'u'.
Project 'HexEditor wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'HexEditor wx3.2.x (64 bit)', target 'default': Replaced custom var 'u'.
Project 'IncrementalSearch wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'IncrementalSearch wx3.2.x (64 bit)', target 'default': Replaced custom var 'u'.
Project 'KeyBinder wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'KeyBinder wx3.2.x (64 bit)', target 'default': Replaced custom var 'u'.
Project 'Library finder wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'Library finder wx3.2.x (64 bit)', target 'default': Replaced custom var 'u'.
Project 'MouseSap wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'MouseSap wx3.2.x (64 bit)', target 'default': Replaced custom var 'u'.
Project 'Profiler wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'Profiler wx3.2.x (64 bit)', target 'default': Replaced custom var 'u'.
Project 'ProjectOptionsManipulator wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'ProjectOptionsManipulator wx3.2.x (64 bit)', target 'default': Replaced custom var 'u'.
Project 'RegExTestbed wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'RegExTestbed wx3.2.x (64 bit)', target 'default': Replaced custom var 'u'.
Project 'ReopenEditor wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'ReopenEditor wx3.2.x (64 bit)', target 'default': Replaced custom var 'u'.
Project 'rndgen wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'rndgen wx3.2.x (64 bit)', target 'default': Replaced custom var 'u'.
Project 'Clangd_Client wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'Clangd_Client wx3.2.x (64 bit)', target 'default': Replaced custom var 'u'.
Project 'SmartIndent wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'SmartIndent wx3.2.x (64 bit)', target 'SmartIndentCpp': Replaced custom var 'u'.
Project 'SmartIndent wx3.2.x (64 bit)', target 'SmartIndentHDL': Replaced custom var 'u'.
Project 'SmartIndent wx3.2.x (64 bit)', target 'SmartIndentPascal': Replaced custom var 'u'.
Project 'SmartIndent wx3.2.x (64 bit)', target 'SmartIndentPython': Replaced custom var 'u'.
Project 'SmartIndent wx3.2.x (64 bit)', target 'SmartIndentLua': Replaced custom var 'u'.
Project 'SmartIndent wx3.2.x (64 bit)', target 'SmartIndentFortran': Replaced custom var 'u'.
Project 'SmartIndent wx3.2.x (64 bit)', target 'SmartIndentXML': Replaced custom var 'u'.
Project 'Exporter wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'Exporter wx3.2.x (64 bit)', target 'wxPdfDocument': Replaced custom var 'u'.
Project 'Exporter wx3.2.x (64 bit)', target 'makefont': Replaced custom var 'u'.
Project 'Exporter wx3.2.x (64 bit)', target 'minimal': Replaced custom var 'u'.
Project 'Exporter wx3.2.x (64 bit)', target 'pdfdc': Replaced custom var 'u'.
Project 'Exporter wx3.2.x (64 bit)', target 'default': Replaced custom var 'u'.
Project 'SpellChecker wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'SpellChecker wx3.2.x (64 bit)', target 'hunspell': Replaced custom var 'u'.
Project 'SpellChecker wx3.2.x (64 bit)', target 'wxSpellChecker': Replaced custom var 'u'.
Project 'SpellChecker wx3.2.x (64 bit)', target 'plugin': Replaced custom var 'u'.
Project 'SymTab wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'SymTab wx3.2.x (64 bit)', target 'default': Replaced custom var 'u'.
Project 'ThreadSearch wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'ThreadSearch wx3.2.x (64 bit)', target 'default': Replaced custom var 'u'.
Project 'Tools Plus Plugin wx3.2.x (64 bit)': Replaced custom var 'u'.
Project 'Tools Plus Plugin wx3.2.x (64 bit)', target 'default': Replaced custom var 'u'.
Also, it is prompted that I need to save all the project files, so I press YES button.
If I check on the "replace only search pattern", the issue still exists.