Please, go to Betheme -> Theme options -> Fonts -> Size & Style.

You used a prohibited name for the category slug.

1) You can switch between header versions, and style them however you want.

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(Image)

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The menu from the demo was not imported correctly or did not assign.

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1) Sorry, but your message confuse me. So does it display on mobile or not?

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1) One file that generate automatically was incomplete, and it was causing this issue.

Hi,

1) I do not see CSS for icon change in your custom CSS.