I have been having this issue for quite some time and this is frustrating. I really love the tool but that bug is killing me.
The tool remember in which screen you have place the RIOT tool, if you have multiple screens. The issue is when you are going from a 2 screens or 3 screen configuration to a different setting. For example going from laptop + monitor to just the laptop. If you left the tool in the screen, that is not the main display, you will not see it when you disconnect your monitor.
Therefore we are unable to use it. Can you add a line of code to check screen configuration and put it on the desktop if the tool is not viewable. Thank you