Windows Start button strange operation
New here so apologize if this has been discussed. Tried a search but possibly I am not using the right search terms.
Before the update of Start11 when I press the Windows Start Button, I would get the Start11 Modern style display. Now after the update, when I press on the start button I get a Windows start menu. If I press the start button again, then Start11 Modern style display appears. Press again and it shifts back and forth. Some times when I press the button a second time, the Modern style will flash and disappear.
It is possible that I have maybe changed something in my Windows11 setting and this is the result. I don't know. This is the window that appears.

When I press the Start Button, then Start11 Modern Style will either appear, or it will flash and then shut down.
Any help will be greatly appreciated.
Thanks