Double click to resize Dimension just can´t open it again

when people say 'another screen' they tend to mean something like a sidecar system where the screen plugs into a Usb or bypasses the Gpu in some other way... result = no Vram and no display

you are correct that Vram [normally] comes from the Gpu but thats a driver which tells the system [Windows] to use this Vram and it also needs software [Adobe Dimension] that does use the Vram which the system tells it... in any event we don't know what system you have so best of luck

move it to another screen

try putting it back on the main screen i.e, the one that has Vram and it should start working