How to fix Display Sizes in Option ingame

[fantasymerlin]

Hello,

 

ingame I have a option settings to Set the display size of The window of The runner.

 

I only have the display size 800x600 ingame. When I set the correct display size at the launcher it Starts with The setted display size but if I Chance one option ingame the window will be sofortly set to 800x600.

 

Where I Can fix This?

 

Thank You very much