New document page dimensions resetting as I'm typing them
Create a new document, type in desired page width, press tab to go down to the height field and suddenly it's reverted back to what was in those fields previously. Have to go back and re-enter the correct dimensions.
There is a 2-page discussion about it here, including someone's video capture of it on page 1:
Been having the same issue here for a little while. Just been dealing with it, but it's rather frustrating.
I'm on Windows 10, 22H2, Illustrator 29.2.1 (64-bit).

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Have no idea :( Again, I can’t tolerate this new dialog myself.
Thanks for the heads up... -
Brian Schmidt commented
Sorry, I misspoke, it's not the orientation that's the 2nd thing in the tab sequence, it's the unit of measure (inches). As soon as it hits that, it causes the "shift" and it changes the entry in the width field, so I have to go back and change it (there have been times where I have been just going so fast and I don't notice it's done that and I end up with a document that's not the right size and so I have to go back and re-create it).
Yet it doesn't happen every time, which is the mind-boggling part. If it works correctly sometimes, why does it behave incorrectly other times?
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Brian Schmidt commented
It has popped up again. Creating a brand new document, the horizontal (landscape) orientation is selected by default. I enter a dimension for the width (in this case, 25.5 in.), tab down to get to the height field, but as soon as I do that, it has me back in the width field and it has removed my previous entry. It's something to do with when you tab, when it hits the orientation toggle (which is the 2nd thing in the tab sequence, for some reason, instead of going right to the height after the width: width field -> orientation -> height; is there a way to make the orientation not happen until *after* you've tabbed/entered both dimensions?).
At any rate, I may try toggling that legacy option that's been mentioned.
Thank you!
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Brian Schmidt commented
Hi, Egor,
Sorry for my delay. Some busy days at work, and I'm just now having time to reply.
Yes, I think what you're describing is similar to what I was experiencing (the orientation). However, I just installed today's Illustrator update and I am not having same experience (yet), so maybe something was addressed?
I'll give it a few days and see if it pops up again and will respond back as soon as I'm able.
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Ah, the flawed modern File > New...
As noted in a comment on forums, toggling it to the legacy one can be a workaround.
I can’t reproduce it, but when I watch the video in the other comment, I notice this happens when the assumed orientation changes, and this makes the buttons for it blink back and forth rapidly — as if Ai tries to swap the values from the height field to the width one and stops in the middle — and it looks as if it restores back the previous value!Brian, can you make several experiments to see if it’s what it is?
Try to start from a square artboard, but then try the same for an album and a portrait one, and see if behavior changes.