Hi Spryte_K,
Thanks for your post on the community forum. I'm Nik, an independent advisor here to assist you with this.
It looks like that there is a new look rolled out for the calls app, and I don't see an option to revert this look to the previous one.
To look further and see if there is any recent update to the layout of the calls app, could you please let what MS Teams app version you have?
To find out what version of Teams you’re on, click your profile picture at the top of the app, then click About > Version. This shows you a banner at the top of the app that tells you what version you're running and when it was last updated.
Regards
Nik