Yes, the alternative would be to have a multi-step form (there is a Glide template for that by @Darren_Alderman) but I have a public form, so I cannot use user-specific columns in another table as temporary savers like Darren does.
→ I just need a public 2-step form, that’s why I use first the add, then the edit screen. I need 2 steps because step 1 triggers a webhook.
Another alternative would be the form container though the layout is limited to 1 column. Like Darren, I try to use a “Next” button to control the visibility of step 1 and step 2 form fields.
Unfortunately, this does not work:
A) The submit button is always visible 
B) I have a mandatory field called “Rating” which is in part 2 of the form (you cannot see it in the screenshot) but I can still press submit 