@LMMomTo2 Welcome aboard!
Here's a link to the user guide. a great resource to have.
https://counter.social/userguide.pdf
I believe to go pro you can click on your name (left panel) then on the far right it will show your profile and should have a "Cosonaut pro" icon.
If you're on a mobile device, I'm not sure it looks like tweetdeck. You just swipe to get to the next column.
Groups are on the far right column. At least on PC they are.