Open applications in Windows 10 keep minimizing

Some time ago I had Windows 10 configured such that mousing over a given application in the tray would pop up full screen views of what was open.  For example, I could mouse over an Excel icon and it would pop up three thumbnails, and as I moused over each thumbnail a full screen presentation of it would take over the screen.  When I had the one I wanted I could click into it.  Then it started not working well, which I posted here, and was shown how to enable "Peek."  But Peek would sometimes work, but often when I moved off the thumbnail it would disappear altogether.  So I disabled Peek and it is worse.  Many suggested just using Task View, which would be great, but has the same problem.  When I click on Task View I get a desktop of smaller versions of every open file, but when the mouse moves off the Task View icon they all disappear.  If I move slowly off the thumbnail, sometimes they do not disappear, but it seems random.  So what I am asking for is help to get rid of anything like Peek, and make Task View stick; that is, not disappear.  Seems like a simple thing, but driving me nuts and there are dozens of "fixes" with a Google search.