I assume you are talking about Qt Creator? It's a perfectly fine IDE but I don't use it for KiCad so I have no advice on what settings to tweak.
I think most developers are using Visual Studio on Windows and CLion or XCode on macOS.
On Linux I use CLion, but have also used VSCode and Sublime Text in the past.
Qt Creator is probably the most advanced C++ IDE there is on Linux that is free as in beer, but last time I used it, the interface was not ideal and it was heavily biased towards Qt projects using qmake.
-Jon