Do you have the same issue if you follow the OP’s steps to reproduce it?
Yes, but it is not impossible. The cursor just doesn’t change into the ‘resize’ cursor. So you don’t know if you can start to resize. However it seems to do it.
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Odd, although my windows are a bit squished in SU9 their no way near as bad as in the screenshot and are still useable without needing to resize them.
The only one that is badly affected is the VFR map.
Come on Asobo - where is the regression testing? This broke in the final beta and still went live despite reporting in multiple bug threads here.
If you’re going to run a beta at least regression test and fix the things that are broken by a build - especially if you are asking people to test and respond for you.