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We have our custom theme and a back up theme installed.
The WP health suggestion recogizes the active themes as only 2 (the custom and back up) and suggests to delete 3 unused themes
The unused themes; Twenty-one, Twenty-two and Twenty-three are all visible in the Themes tab, all have the only choice of activate.
There aren’t three dots, or ellipsis, to delete.
If I click on Theme Details, there insn’t any link or button to click other than activate.
How can I delete these themes?