Any good Gazebo Garden tutorials?

I am looking for some good gazebo garden tutorials on the basic functions of the GUI. Unfortunately it seems to me the tutorial docs at are not clear or thorough enough.

For example, it says

The plugins button lists all the available plugins.

But it does not describe where that button is.

It says,

Open the Grid Config plugin by selecting it from the plugins button from the toolbar and selecting it from the dropdown list.

Where is this exactly?

How do I access the Scene parameters, so I can turn off Shadows to improve speed?
How do I see the FPS as in Gazebo Classic?