1. Download the `minimal_theme.tres` file of the [latest version](https://github.com/passivestar/godot-minimal-theme/releases/latest).
2. Make sure `Advanced Settings` is enabled.
3. Open `Editor Settings -> Interface -> Theme` and choose the downloaded file in the `Custom Theme` field.
4. Click `Save & Restart`.
2. Open `Editor Settings -> Interface -> Theme` and choose the downloaded file in the `Custom Theme` field. You'll need to have `Advanced Settings` enabled to see that field.