I think it would be great if, you could lock horizontal scrolling when editing in figma.
Why?
Because Figma is used to make webpages, and apps (amongst other things too.)
Webpages and apps, all have “fixed” horizontal aspect ratios—determined by the width of device the app or webpage is being viewed/used on.
The vertical aspect ratio is dynamic. The horizontal ratio isn’t.
Begin able to “prevent” horizontal panning in edit mode, (and only be able to vertically scroll), would give the user the option to edit in a more “realistic” environment.