How to hide the highlighter button?
For the quick-open button to stop showing on every page whenever you highlight a piece of text, you should just:
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Open your Cluing Extension
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Press the โ๏ธ icon on the top right
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Scroll down to the Preferences section
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Check the โHide quick open buttonโ setting item

After this Cluing highlighter button wonโt show anymore on the web pages you visit.