Windows 10: How to specify a number of MRU applcations shown in the list when I press Alt-Tab?

How to specify a number of MRU applications shown in the list when I press Alt-Tab? Note that I do NOT want to show "all" thumbnails of running applications in the list. I only wanna specify a number in between according to the screen size I have.

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Recent (Save Files) - Change Default Settings to OneDrive

Have you tried the following? how to disable "recent places" in MS Word? - Super User

 

Alt-tab won't switch between two windows anymore

I really need to get back the alt-tab behavior that flips back and forth between two applilcations. I did all the things I found here and some from other web pages, but nothing will let me flip from MS Word to another app I am using and then back to MS Word. Alt-tab only shows me a list of applications and clicking alt-tab again takes me back to whatever I was on before. How can I make alt-tab flip back and forth between two applications with no steps in-between them? That ability to flip back and forth has worked for me on MS Windows for decades. Thanks. Ken - - - Updated - - - When I use alt-tab, and see all the open tabs, releasing tab and then pressing tab does nothing except take me back to the window I started with. Do I need to re-install Windows 10 solely to make alt-tab work correctly?

 

Alt-Tab list always includes Cortana (new behavior)

I disabled Cortana years ago... or so I thought. But starting today, whenever I use Alt-Tab to switch between windows (which I do frequently), the second one in the list (the default I will get if I only press Tab once) is Cortana! If I select it, I get a box saying, "Sign in to Cortana". I can make that window disappear by clicking X, but if I press Alt-Tab again, Cortana is still in the list. Did I do something to cause this new behavior? How do I get rid of it?