Complementing How can I sort "Your Communities" by reputation?:
I would like to choose my main Stack Exchange communities, I mean the ones are listed in Your communities session at communities menu.
Is it possible?
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There is an "edit" button that appears on the right side of the list on the same row as "Your Communities". It appears the user style/script you're using to make a dark theme is hiding that link.
Either disable that style/script, or see if you can find that "edit" link by moving your mouse where it should be.