syntax highlighting disappeares after a few seconds

Hello,

I'm using CLion on an arch-based system and I installed it from Jetbrains Toolbox.

I recently started to learn cpp and so I just have a simple hello world project (plus a few variable declaration, etc. not a long complex file.) and I used Clion itself to create the project (so CMake files are probably Ok). when I open CLion, Syntax highlighting is working and in the top right it says Analyzing and then suddenly after a few seconds, It probably finishes the Analysis and then syntax hightlighting for almost everything (excpet cout, int and return) disappears and string (which is from std), variable names, values, etc all turn gray.
I tried disabling Nova. also I tried disabling “Use clang-tidy via clangd”. also I changed CMake to system one (instead of bundled). and I already have gcc (cuz I can compile things in vscode via it). also I changed bundled GDB to Bundled LLDB and it didn't work too. (trying system one aka ‍ ‍`usr/bin/gdb` said Version 17.2; supported versions are 7.8.x-16.3.x). and Yes, all didn't work at all

Thanks!