I was able to modify the hostingConfig for the web renderer of Adaptive Cards to display a list of actions horizontally instead of vertically. The problem is that at a certain quantity the buttons go beyond the lateral border of the card and user can't see more than 3 or 4 actions.
Is there a way to wrap the actions so that once a button doesn't fit the width then it continues on the next line? or that the user can scroll horizontally?
This was fixed in Adaptive Cards v1.5:
https://adaptivecards.io/blog/2021/Announcing-1.5/
As youre apparently rendering cards yourself, you just have to update the library.