Yahoo mail unable to access multiple accounts via Yahoo back button at top of screen

I have an iPad Pro 2nd generation; I have two yahoo mail accounts I use. When I opened the yahoo mail app today it only showed one of the accounts, and no longer showed the <Yahoo! At the top left of my screen which allows me to access all inboxes and accounts. Is this a new update? It was working fine yesterday. Any help is appreciated. I have enclosed two photos, one from my iPhone showing the <yahoo option at the top left, and the other is my iPad that now is missing that option. Thank you.