Thanks my friend. the Alt+Enter did the trick for me. Thank you for your help

Hey I have successfully been playing AOE3 on my iMac 5k for a few hours. Then i decided to set the in-game resolution to 4k instead of the lowest resolution available. But it doesn't work. Instead it magnifies the 4k resolution so much that it goes beyond the bezels of my iMac. If the "Help and...