Dear customer kindly have a look into the existing KBA https://userapps.support.sap.com/sap/support/knowledge/en/3226460

Dear customer, you can restrict the access and take the form template maintenance view away. Or do you want to restrict to edit the output settings before releasing or submit a document. Is it that what you are looking for ?

Hi one addition if you dont use the sender email via the output channel the application logic applies. Its not that always the default sender adress from tyhe Business config is automatically picked.See i.e. Sales logic in KBA   2217871 - How is the ...

Dear Ismael we have a KBA for this kindly have a look into it https://userapps.support.sap.com/sap/support/knowledge/en/3286434