HiDPI issue on KDE (Tiny everything)

I’m live booting from a flash drive for testing purposes on a Dell Inspiron 7506 laptop with an i7-1165G7 and a 4k display. When the desktop loads everything is so tiny that I have to use my phone’s camera to zoom in and see what’s going on. In the display settings it doesn’t give me any options for other resolutions then 4k. I tried adjusting the scaling and hit apply, nothing changed.

Am I just out of luck here? I’m on the road and don’t have a lower resolution display to hook up through HDMI or anything. What can I do?

Settings => Display and monitor => Display setup:
Global scaling: here move the slider until it fits, but better adjust the value in %. The font size follows the scaling.