Is there a way to customize the control section in app studio so that users cannot click '+Add Filter' and see all columns from all data sets as filter options? I want to limit their filtering options to just 5 specific columns
I don't think there is any way to disable the '+Add Filter' option in the filter control on App Studio. But there are other ways you can limit the filtering options. Card Filters on specific columns, custom filters, permissions and roles to restrict datasets, etc.