A few days ago, my display in Kubuntu 18.04.1 suddenly was magnified as if, from that time onward, a virtual display has been kept in memory which is perhaps twice as large vertically and horizontally as my physical display.
The virtual display thus contains a magnified version of what I want on my physical display. My physical display then presents only perhaps one quarter of the virtual magnified display, depending on where my mouse pointer is.
For instance, when I move my mouse pointer to the left hand top corner of my physical display the left hand top ~1/4 section of the virtual (magnified) display will be displayed on my physical display.
I can still use my laptop this way but, as you probably can imagine, it is awkward.
I am writing the posting you are reading on this laptop. I have used Kubuntu for many years. Since my last installation of 18.04, perhaps about 6 months ago, it has been running acceptably on my old System_76 Bonobo Extreme laptop. It would seem that pressing some combination of keys, or something in settings, should get me out of this mode. Rebooting my laptop does not solve the problem.
I found a problem perhaps similar to mine but no solution was offered.
How can I get unstuck from this unwanted screen magnification mode?
