Lock page width/height while building?

im not sure if it’s user error on my end or if bubble is widening the set width of the page but it seems like every few hours i have to re-center nearly everything because of pixels being added to the right or bottom of the whole page. For example, if i have a nav float group bottom 0px, after a few edits it’s suddenly 20px north of the bottom even if it’s set to 0. This happens all the time. But now I’ve noticed it happens with centered objects too, so things look off-center after a few edits and i have to go back and recenter every element on that page

Pretty sure is the same problem that has been identified later on this forum (couple of Bug reports on).