I have found, albeit temporary work around for this as I HATE the un user friendly Outlook (New)!
Try this and let me know if it works for you, Right click on the "start", click with the left mouse, installed apps, scroll down to Microsoft 365-en-us. Click on the "three dots" to the right and select "modify". Click on "yes" and then click on "repair".
This only temporarily works for me, however, at least you can get back to the outlook Classic that we prefer.
What a nightmare! Why, Microsoft, are you forcing us to use something that we don't want! Aren't you even listening to your consumers?