Have you tried setting the map control Height and Width property?
I cannot replicate this. The map extent does not change for me when I resize my web browser. Maybe you can check in your application if you perform any zoom or pan before the size of the map is changed.If you have some code to share or steps that will help us reproduce the issue, that would be great. Please try to keep the code to minumum as much as you can. Thank you.
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