Adding CMS collections to tabs

Design help CMS
1

Is it possible to display content from 1 collection list on one tab and another collection list in another?

I’m trying to show upcoming vs. past events on a profile page, but when I added the second collection list, it deleted the first and replaced the data.

2

You can have up to 20 collection lists per page, and there are no restrictions on using them inside of a tab element.

Not sure what you did and you didn’t share your site readonly link, but you shouldn’t have any problems here.