Side Menu not showing?
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There should be an arrow on the left to click on? Do you have that?
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You should check your log file to see if there are any errors while loading the aircraft
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I had this problem using X-Plane 11.50 b3. It turned out to be setting the UI size to 150% (I'm using a 4k monitor). After setting it to 100% I could see the tag to bring up the side menu.
The new Better Pushback plugin is similarly affected on the X-Plane Beta.