Marketplace - RMA - Vendor RMA deletion permission
RMA deletion by Vendors permission
Depending on the level of trust that you have for your vendors you may decide to change their permission to delete RMA requests from the Vendor panel keeping the RMA request list nice and neat or not to permit them meaning that all RMAs remain visible for you to check.
To toggle this permission on or off, from the admin panel navigate to Store → Configuration → Marketplace RMA → Configuration. Next locate the Vendor can delete RMA option.
Difference from the Vendor's perspective
Setting this option to No will simply remove the Delete button from the Vendor panel in the RMA list view.
The RMA view for Vendors with the permission to Delete enabled
The RMA view for Vendors with the permission to Delete disabled