If you would like to delete the 2017 theme you will need to log in to your admin panel, click ‘Appearance’ and then ‘Themes’. You should then see a list of all themes installed.
Click ‘Theme details’ on the 2017 theme and in the bottom right corner you should see ‘Delete’ (as long as it is not the live theme on your site).
I’ve just run this on my admin panel and it works correctly. Do let me know if there is anything further I can do to help.
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