It's ridiculous how long this has been going on.  As you can see, the first post in this thread is from Jan, 2019.  I've had QBO for a little longer than that, and have had the issue continuously.  Just randomly enough to not chuck the whole thing, but often enough that it's a genuine frustration.

I did take it all the way to phone support once.  She was ready to give up on fixing it, until I gave up and said "close enough".  It worked all right for a while, then, mostly, but it still goes wild at times and resists any input - absolutely randomly.

Example, today, when I looked at my Product Categories, only one column was visible.  I'd never seen this before.  There are only 2 columns in the Categories - Name and Action.  Now, how on earth can anyone account for the fact that the Action column is wider than my entire screen?  I CAN get my cursor to find the border line on the far right of that column, but it will absolutely NOT MOVE.  So all day I've been working with Product Categories having to slide the window back and forth because I can't see a measly two columns at the same time!

And there are only so many times I can refresh the browser, clear the cookies, check for updates, try other browsers, etc., etc.(I tried every one of them but nothing changed), but I would think that after AT LEAST 3 years of people having this problem, Intuit would be able to figure it out.  All I can guess is that you have, but you don't feel the cost warrants it.  I suppose maybe you don't have QUITE enough people quitting to make it worth your while.  But really, this piddly stuff that we all take for granted in other software we use absolutely ruins an otherwise positive experience.