I just installed Eclipse 2021-03 version on my computer and one thing I noticed was it being set up to a Dark theme by default. I am pretty much used to the Classic Theme, so here is how I set the theme back to the default one,
- Go to Windows (Eclipse in case of macOS) menu option,
- Go to General -> Apperances,
- Now uncheck - "Enable theming"
- You will see a message saying "Theme change: A restart is required for the theme to take full effect."
- Click on the restart hyperlink.
- When you restart eclipse the theme should be back to the classic one.

Image: Disable theming

Image: Reset Eclipse Classic Theme
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