Bootstrap 5 navbar content area not responding

when i include content area to bootstrap 5 navbar, i can’t control it to add a button or anything

Works here. In your screenshot you have the navbar selected, not the column that represents the content area. Have you tried selecting the column that contains the content area on the screen and maybe even in the layers panel on the left side?

I can confirm same issue here. When I switch to BS4 it works.