User interface scaling is stuck and won't change

In an attempt to increase the font size, I went into the Preferences and increased the user interface scaling to 200%. It's so huge I can't process photos. So I went back into Preferences and user interface scaling is stuck on 200% and I can't change it back to Auto or 100%. I've tried Ctrl+Alt+Shift, clearing the cache, and disabling the startup scripts but nothing works. How do I get the scaling to change and how can I change the font to something I can actually read whether I'm using my laptop screen or laptop connected to a larger monitor?