I have the same problem and it is driving me nuts.
I am on Sonora template and I have forms for people to fill in to download a PDFs.
The form works but on hitting the submit button the pdf opens in the same tab (😨😨🫣😳)!
Double and trebled checked the toggle and it looks on, but still is not doing what is supposed to do!
Has anybody found a solution that actually works?
Grateful for any insights..