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How do I change the theme (light or dark mode) in RJL System Cleaner?

RJL System Cleaner supports three theme options:

  • Auto (match Windows) -- The app automatically follows your Windows theme setting. If Windows is set to dark mode, the app uses dark mode. This is the default.
  • Light -- Forces the light theme regardless of your Windows setting.
  • Dark -- Forces the dark theme regardless of your Windows setting.

To change the theme:

  • Go to Settings (Tools menu) and change the Theme dropdown, or
  • Use the View menu and select Theme, then choose Auto, Light, or Dark

The theme change takes effect immediately.

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Added: Feb 22, 2026   |   Last Updated: