Hi Graham,
I must be honest - it was purely by accident that I discovered how to do it.
(Using Windows 11)
Firstly I "right-clicked" on the desktop icon and then clicked on "Show More Options"
Then click on "Properties"
Then select "Compatibility" from the tabs at the top
Then select "Change high DPI settings"
From this pop-up I then "ticked" Program DPI "Use this setting to fix scaling problems for this program instead of the one in settings"
deselect "High DPI scaling override
and then run the program.
Everything worked a treat and I am back up and running again!
I have no idea when it comes to background computer stuff so nobody was more surprised than me to find the solution!
London Control is an amazing simulation and I am looking forward to many entertaining hours ahead! Unfortunately I cannot get the Voice-Recognition to work properly but I have managed without that for the last 20 years so I don't mind.
Best Wishes, and thanks again to the team.
Fell