When I start to share my Screen in Jitsi session in chrome I can choose from 2 Screens.
When I start the same from Rocketchat 2.17.7 I see just one screen and my mouse cursor appears only when the cursor is on the screen which is not shared.
My screen setting:
Windows main screen - left - 1920 x 1080
Shared screen - right - 2560 x 1440