Hi, thanks for reaching WCMp Support!!
We are really sorry for this inconvenience, I have added the attachment of the Vendor Staff Doc.
Now coming to the queries :
1. We’ve added our license and it (the license) shows up with the rest of the licenses in the backend.
>> You will be able to view all the add-on under WP-admin >> WCMp Licence. Here you will get all the names of the addon in a separate tab and provide their license key.
2. There is no other backend menu item to be found for admin control of vendor staff.
>> As this is vendor staff, here vendor can only add their staff and share the work amongst them. Admin has no such settings for this.
3. There is no front-end menu or settings showing for store admin to add vendor staff.
>> Vendor Staff has no menu on the admin side. The vendor can access the menu via their backend and add the staff.
Let us know if you have any further query.