Edit/update: Perhaps I missed it before, but the ability to "Duplicate" an Interface page to another Interface Group is perfectly fine workaround. This serves the same purpose as a "Move" would. Thanks Airtable team for making this feature. 

+1 to smaller Number element sizing option

This would certainly be helpful. Or the ability to move a "section" at a time. There are times of the year when we want a certain section towards the top of an Interface page, and it feels very cumbersome to move each individual field and essentially...

Admittedly, I've created pages in the wrong Interface group before and it's quite frustrating that I have to completely scrap and start over. +1 to being able to move pages to other Interface groups within the same base.