Rainyn - offered this and it worked for me.
"Check out the web version of MS Teams - it still retains the older interface. And if you are using the new MS Edge browser you can go to the Settings menu in it, then to Apps, and then choose "Install this site as an app". Whichever page of Teams you have open when you choose that will become the default page of your new Teams web app. You can pin that app to your taskbar just like another program."
Unfortunately, Mac users (at the moment) don't have a fix - If you are a PC user - by opening Microsoft Edge browser visit Log In | Microsoft Teams. You can log in and the (now older version) Calls page will appear normal. Follow the instruction from Rainyn above and you have a good fix - Until Microsoft figures out they can muck this one up too!