(marimo team-member here)

I have had a similar situation and my "hack" for this was to start the same notebook twice and have two tabs open. This worked for something things ...

Other times I just bit the bullet and made two forms on two variables so that everything would fit in a single notebook. By having two variables that contain all the inputs you can make sure that only the cells update that need to update. It takes a bit more effort but makes a lot of sense for some apps that you want to share with a colleague.

If you share more details about your setup I might be able to give better advice/think along more.