In JetBrains Fleet, you can sync the color theme with the OS, select one of the predefined ones, or create your own.
Select the color theme
Press ⌃ ` and select the required color theme.
Alternatively, go to settings ⌘ , and select the color theme in.
If you want to create your own color theme, you can do that through a JSON file.
Create a color theme
Press ⌘ ⇧ K, start typing
Edit Color Theme, and select it from the list.
A separate tab opens in the editor. Tweak the values in the theme file as required and give it a name. If you want to delete the theme later, remove the corresponding file from the themes folder.
Theme files location
Custom themes are located in the following folder: