I am using C:B nightly 11927 (build NOV 17, 2019), and found that the "Symbols Browser" disappeared.
Then I searched in the forum, and know that it can be disabled in "Settings > Editor > Code Completion > Symbols Browser".
I checked and found that the option "Disable symbols browser" is gray, unable to turn on/off.
It seems that Symbols browser is not available in this copy. How can I make it available?