How to prototype double scouble in one frame

Hi everyone! :wave:

Could you please help with advice on how to make a horizontal scroll of both cards from left and right sides? It works only with one card if I select “Fix position when scrolling” on a header, footer, and on the other card.

The same pattern you can find on MS Teams. From the left, you have Chats with users, from the right side Opened chat

UPD: I need to be able to scroll them separately.