How to Enable Dark Theme in GIMP 2.10 on Windows 10?
Step 1: Open GIMP Software.
Step 2: Click on 'Edit' in Menu, and then click on 'Preferences.'
Step 3: In Preferences window, Expand the 'Interface' by clicking on the '+' button, and then click on 'Theme.'
Step 4: Click on 'Dark,' and then click on 'Ok' button.
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https://www.youtube.com/watch?v=Oh24e6r-uHg