I'm not quite sure what you are seeing but if you go to Settings the first thing is a tick box to show the Start Screen. Try un-ticking it.

Thank you. However, when I put Search into the Search box no tickbox appears for me to delete. (I have Windows 11).

- click settings>general and it's the first item on the right - the start screen,

Press Alt-e and a drop-down menu appears. The next-to-bottom item is Settings. Click that and the first thing you'll see is the box.

Thanks. However,each time I have pressed Alt-e nothing at all happens.

1. click the menu in upper right
2. then click 'settings'
3. in settings>general, the top item is the start page. Just untick.