What permissions must be set in 10.14 and 10.15 (Mojave + Catalina) in order to use Remote Control and Live Connect? Or, I can only see the background when I remote control a macOS agent.
There are two different permissions that must be set in order for Kaseya Live Connect and Remote Control to work on the latest version of macOS. Under System Preferences / Security & Privacy / Accessibility (Picture 1) and Screen Recording (Picture 2). You must allow the KaseyaRemoteControlHost, and ensure it's checked on both areas.