What key combo did I just press? Screen res dropped and some programs look bad

Question

I have pressed something accidentally and every program just looked turned hideous, after a bit I found the resolution dropped to 1366x768 instead of the native full HD. Even after changing back to full HD the contents of Double Commander and NotePad++ but not the their menus looked incredibly bad, apparently a log out and log back was necessary because scaling have dropped and didn't reapply after resetting the screen resolution.

So, how did this happen?

Answer 1

It seems you've triggered a Windows "Accessibility" feature. See Windows keyboard shortcuts for accessibility for all shortcuts, but most likely it was Windows+, magnifier. To get out of magnified view, first be sure that's the issdue by pressing Windows+ again, and then pressing WindowsEsc.