In one table only, Grid Edit does not allow editing

Yes this was helpful. I found that this table only did not offer the option to manage forms as you showed. When I added a second form to the list of forms, the choice to manage permissions was displayed and I was able to use the override to allow grid edit. 

I still do not understand why my role (Administrator, App Owner, Company Billing Rep) cannot grid edit this one table as part of the standard behavior. All of the choices in Roles would seem to indicate that I should be able to.