For those on macOS Catalina who use their iPads via the Sidecar feature, Moom 3.2.16 should now work as expected when Sidecar is active. That is the only change, so the release notes are a pretty boring read.
Direct users should see the update available in the Updates tab in Moom’s preferences, or you can download a fresh copy of the app from the Moom page. App Store users should see the update in the App Store app—if not now, then very shortly.