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I have a problem with a sketch. After I've extruded it, I can still see the same sketch on top of the object. I've had this problem a few times but I've never understood why it's happening. Here's the screen shot.
You can change this behavior via preferences:
Preferences -> General -> Design -> Auto hide sketch on feature creation
Preferences screen can be activated when you click on your user name (in top-right corner) and then on Preferences
Required, but never shown