How can I simulate with the participants (attende) what in presence I would show on a blackboard (e.g. graphs and formulas written at the moment)?

Once the meeting has started click on "Share screen" (the green command on the bottom bar) and then on "Whiteboard". A sort of whiteboard will appear on which to write down, draw, write formulas, etc
It is also possible to connect a graphic tablet to your device, and share it as an "additional desktop" with the participants ("Share screen" → "Screen"); or you can use an iPad connected to the PC (and to the same wireless network), by downloading from the Apple Store the App
Educreations(in this case, click on "Share screen" → "Phone / iPad" within the meeting ). 


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