No title bar on Gazebo7 under Ubuntu 20

osrf/rocker is a lovely docker project which make building ROS environment rapidly. It supports Ubuntu 20 and the latest Nvidia driver. ROS GUI applications and tools work properly with hardware acceleration.

However, when I tried to run Gazebo 7 under Ubuntu 20, there is no title bar on the top and I cannot resize this window.

Press F11

The solution is tricky, just press the F11 key twice!

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