Hi @Denise Baxter you can disable comments via the board's "Settings" in the board menu on the right side of your board. Click "More", then "Settings", then select "Commenting Permissions" and choose "Disabled". Only board admins can disable comments.https://help.trello.com/article/792-disabling-comments-on-cards
Based on the article it appears to be an on off switch for the board, not for individual cards.
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