Remove Geminus

I want to remove Geminus.
I thought one of my 2 screens was no longer holding its 'picture' for
the right-hand one flicked 'on' and then turned black.
I replaced it with a different screen which worked ok but is not the
same physical size so I reconfigured geminus from (2 screens) 2560 x
1024 to (1 screen) 1280 x 1024 - on the original Iyonix card. However
since I'm not running 2 screens I want to remove Geminus, but I don't
want to end-up with no way of seeing what the Iyo is doing.
Need I worry?

--
BW Chris F. [British Iyonix Computer, operating RISC OS 5.16]

"It is quite a three pint problem, and I beg that you won't speak to
me for fifty minutes." Dr. Arthur Holmes.
.