be theme: theme option icon didn't show

Hi support team,
I have 2 questions need your support,

1.When I want to set "be theme option", the option icon just appear 1 sec, then disappeared.
I use Macbook pro. Is any software required?
image

2.Can  I remove the breadcrumb the "red square" part? Where do I set the option?
image

Thank for your Help.

 

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