Try changing the desktop resolution to the in game resolution, that should give the ability to select ‘dont show again’. After that reset your desktop resolution back to default.
I have found that in unless my desktop and in game resolution matches in devmode my cursor tends to be off by the same difference.
I updated to SU9 and then had the SU9 patch. The sim was previously in dev mode and now is inoperable. There is a Asobo recruitment ad in the middle of the screen that can’t be dismissed. There is no ok button and the do no show again tick box dosen’t work. With the ad there and being unable to dismiss it I can’t exit dev mode and can’t use the sim.
Also presing alt+Enter dosen’t work, it dosent allow me to interact with the ad. The sim has also been rebooted sveral times and this has no effect.