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How can I add a button for Text Style/Strikethrough?

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Is there a way that I can add a button for Text Style/Strikethrough to the compose window, next to B, I & U? Mac system shortcut didn't work: it now shows it in the menu as the shortcut ('Command /') & the menu flashes as if it's working, but it doesn't.

Is there a way that I can add a button for Text Style/Strikethrough to the compose window, next to B, I & U? Mac system shortcut didn't work: it now shows it in the menu as the shortcut ('Command /') & the menu flashes as if it's working, but it doesn't.

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Awesome, that's perfect, thank you! I had searched the add-ons for 'strikethrough' but they have misspelled it so it didn't come up!