New with Google Merchant Center since 04/2024 … the Feed function in Merchant Next does not exist.
I followed your video and others … like that of Clarice Lin ( https://www.youtube.com/watch?v=GjVvf2RZuaw ), but same here. The vid is 2 years old, I suppose that time Google had a different version.
How to change this Identifier to “false” (or “no”) ?? I had been in contact with Google … but their answer via email was only: We cant do anything, its the system. Check out on your own. Ridiculous.
I have 4,000 pages in my shopify system, so says Google (I suppose they identify every color, size and hardware combination as single page), related to 370 products. Google says in the Merchant center, that theoretically I can expect per week 3-4.500 clicks . So I lose lots of money, as the products are flagged “red” 
Hope to get help here quickly. Its desperatful situation.