I have tried loads of resolutions and none make it switch even when enter is then hit ... low res on and off ... no difference
Anyway I can try and edit an ini file to change?
It defaults to 1920 x 1080 75hz and I want it at 60hz 1920 x 1080 60hz
I'm afraid not. But you want to change the refresh rate? I believe changing the resolution merely changes the look of the game, not the actual resolution of the screen. So my best bet is to change it in your system settings for the moment.
I'll add an option in the future to actually change the resolution on a system level.
Are you using Windows? Or Mac?