I've been developing my game in window mode and havent really given a thought to resolutions until recently since my game is progressing. Regardless i though i'd try it in fullscreen for the first time as a test but realised that on my widescreen laptop monitor the game is stretched.
What can we do about this?
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Well, if you're using something like 640x480 on a widescreen monitor, it's either got to stretch it or add bands to the sides. You could detect the user's desktop aspect ratio on startup using the System Information object, and use the Change Display Resolution action to go to the best resolution in that aspect ratio. Then you can go fullscreen and it keeps the user's aspect ratio. However, the runtime will stretch the display to fill the extra room unless you set the resize mode in application properties to "show more content".