Hi @mcworks
If you have a Multisite Installation, in every single subsite you will be able to manage only the plugins which are active on that subsite. FDP will not see those plugins that are globally active in the Network. And you have to activate FDP on every single site, not globally on the Network.
It’s Multisite compatible, however, the users who use it on a multisite are a lot lower than those who use it on standard installation. This means that there are fewer tests on the fields, hence a higher probability you have a bug that wasn’t seen before. But this is true for all those plugins that still don’t have many installations, including those that declare to be 100% compatible with multisite.
In any case, if you have any issues on the multisite don’t hesitate to open a thread on this support forum.
Have a great day!
Jose