At this point, the one that shares his desktop might let the control of his mouse (and therefore of the whole shared area) of any user connected, simply by clicking with the right mouse button on the corresponding window of the users list, and select “Let screen sharing control”.

The supervisor enables the remote control of the mouse to the user
At this point the user has the remote control of the shared area in the supervisor's PC, and can work on the file or document. To regain control of the mouse, the supervisor must return to the user that was enabled in the Users list window, and press the right mouse button to see the drop-down menu, then select with the left button “Take screen sharing control”.

The remote control of the mouse to other users
does not lose completely, when the mouse responds to the physical signs of both
at the same time. The same happens with the keyboard controls. It is then
necessary to “raise your hand” from the mouse to allow the remote control to act
on the shared area.