You are reading the documentation of FileRun 2026.4.0, which is not released yet. It is subject to change, so do not use it for planning. Read this page for FileRun 2026.3.0

Custom CSS code🔗

As software updates are replacing FileRun's files regardless of the fact that they have been customized, there is a way to make CSS modifications which will be preserved between software updates.

You can write your custom CSS code inside the file customizables/theme.css and enable it from the control panel. Navigate to Interface → Branding → Theme section and enable the Apply customizables/theme.css option.