You should remove unused themes. It is considered good practice to protect your WordPress website from vulnerabilities by not keeping old, unused themes.
Steps to delete a WordPress Theme
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Log in to the WordPress dashboard.
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From the Dashboard menu, go to Appearance and click on Themes.
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Hover your mouse on a theme you want to remove. Click on Theme Details.
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Click on Delete and Confirm with OK. You can find the Delete option at the bottom right area of the window.
You have successfully removed the theme.
