Position your mouse pointer anywhere on the desktop (except directly on the Taskbar or an app icon) and right-click.
This will bring up the desktop right-click menu. Go to 'Display settings > Resolution' and choose your preferred resolution.
You will be given a preview of how your chosen resolution looks on your screen.
If you are unsatisfied, click 'Cancel'.
If you are satisfied, click 'Confirm and restart'. Please note that this choice will restart your Remix Mini and result in a wait of up to a few minutes.