You should be able to set the target monitor by starting Do from the terminal and prepending "DISPLAY=:0.x", with x being the index of your monitor starting with 0.
E.g. "DISPLAY=:0.1 gnome-do"
You should be able to set the target monitor by starting Do from the terminal and prepending "DISPLAY=:0.x", with x being the index of your monitor starting with 0.
E.g. "DISPLAY=:0.1 gnome-do"