Review on JUN-ELECTRON 3.5 inch Raspberry Touchscreen Display Monitor, 320X480 Resolution - E361 by Cliff Schreiner

Great screen. Works as advertised. I don't know how to contact anyone with questions, so I'll post them here and maybe get some helpful feedback. Once I set it up I can no longer connect and use a full size HDMI display. I increased the resolution with the configuration as stated but it doesn't help much and still doesn't work. Has anyone done this work? Related question, how do I turn this off so the screen doesn't work and go back to using the HDMI screen normally? Otherwise I have to ssh or VNC into the device if I want to interact with it in full screen mode.