How to set different feed settings based on collections/products?

Since effective feed settings is the result of feed settings, collection level feed settings and products level feed settings, you have multiple options to adjust the feed settings to your need.

1/ Feed settings based on collection or collection level feed settings

This can be done from the feed group editor. Please note that since collection level feed settings is part of the feed group settings, they apply to all the feeds under the same group.

2/ Feed settings based on products or products level feed settings

This can be done from the Products tab. These settings will be used for the products regardless of which feeds they are in.