This seems to have been an issue for quite a while, and was wondering if it's ever been solved. I would like the ability to adjust the container size, so you don't have to scroll.
WordPress is a third party website we work with so you'd need to reach out to them about this and see what options you have.
We aren't trained on WordPress to assist here. Let us know what they say!
This is an issue with the Square script, not a WordPress issue, as I'm sure you are aware. There have been other inquires as to this issue.
This is the WordPress reply: I'm sorry it is not possible to remove the scrolling from our end as the height of the appointment window is coming from the script.