iPadOS 26.6.2 Mail app no longer lists InBoxes to various email accounts on top of the sidebar.

iPadOS 26.6.2 Mail app no longer lists InBoxes to my various email accounts on top of the sidebar. This is making it more cumbersome to switch between accounts, which I do several times a day. How can I fix this? It’s one of the best features of the Apple email app. Please help!!!