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IMO, full paths are probably uncomfortable because they can be much longer than relative paths and may simply not fit in a window while they do contain redundant information that only brings confusion instead of help.
You can try to uncheck "Settings -> Compiler and debugger... -> Global compiler settings -> [the compiler you use] -> Other settings -> Advanced options... -> Others -> Use full Paths for source files (GDB workaround):".
But it can break debugging in some cases.