Domain Mapping plugin isn't in the list of Plugins in the "Select an installed plugin ortheme" menu.
I've been trying to solve a conflict between domain mapping plugin and the events calendar plugin with Modern Tribe. However, their suggestions have not worked out so, I am now reaching out to you for assistance. The issue is that when a subsite is mapped to a custom domain and the subsite uses the Events Calendar plugin, the navigation link in the calendar does not work (spinning cursor). The calendar works only when the domain mapping is set to the original domain as the primary domain.