Settings

Last updated: 22 October 2026

What it does

Settings holds the few choices you might want to change. Everything is set sensibly from the start.

Setting	Default	What it does
Scan when Underbrush opens	On	Scans the last drive you picked as soon as Underbrush opens, so the numbers are ready.
Set Your call items aside for a week before deleting them	On	Lets you put them back from History. The space comes back when the week is up, or straight away with Delete now. See Clean up.
Check for updates once a day	On	Sends only the Underbrush version, your operating system version and an anonymous ID for this computer. Nothing about your files.
Send crash reports to help fix bugs	On	If Underbrush crashes, sends the technical error with file and folder names removed.
Send anonymous usage data	On	When a scan or clean-up finishes: how many files, how long it took, how much was freed. Never names or folders. Underbrush always reports when it opens, closes, or a scan or clean-up fails, so we can fix problems. See Privacy.
Keep a diagnostic log	On	Writes what Underbrush does to a log on this computer, kept for a week. It's sent only if you tick Include diagnostic info when you contact support. Folder names are removed as each line is written. Open the log folder shows it.

Open Settings with the ⚙ button at the top right.

Underbrush picks a size for your screen the first time it opens. To change it:

Press Ctrl + and Ctrl − (Cmd on a Mac) from anywhere in the app, or use Size of text and layout in Settings.
Press Ctrl 0, or click the percentage in Settings, to go back to 100%.

The size is saved in settings.json:

Still stuck? In the app, use Help → Contact support, or open a ticket here.