I'm using Codelite 15.0.5 in virtual Programming Machines on KUbuntu 20.04 64bit and Windows 7 64bit.
On opening the i.e. Setting or the Colors and Fonts Dialog it seems that the Dialogs grown on every time they was opened. I can't decrease them to a smaller size. Only increasing is possible. This affects also the Build Settings Dialog and others.
This is a bug with wxWidgets and I did not encounter it in couple of years now
Their persistency manager does not take into consideration the window decorations so they get added everytime
This is the main reason I stopped using it, but I surprised to hear that this still happens to you. Can you try this with a different window manager? (e.g. lightdm or gdm3?)
with Codelite 15.0.5 it is the same issue on Windows 7 64bit VM.
I quickly tested on Linux Mint 20 Cinnamon 64bit. CodeLite 15.0.2 can increase and decrease the Dialogs, but not saving the Size and Position for next Start.
With CodeLite 15.0.5 the issues are the same as on Windows 7 64bit or KUbuntu 20.04 64it.