Depending on your distro and your desktop environment, there's probably a platform plugin that sets the colors of Qt programs.
Once you've selected Preferences > Appearances, then select the Code View tab on the right. You should see tabs for Code view, Preview, Icon Themes, and Main UI when "Appearance" is highlighted on the left. The background and text colors are handled by the theme. You'll have to figure out how your system is theming Qt programs and adjust the background there. Probably kvantum and/or qt5-ct.
Last edited by DiapDealer; 07-30-2022 at 04:01 PM.
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