Sometimes you may need to delete a sitemap from Google search console because the URL no longer works or you don’t want to leave a sitemap address in the Google search console.
This post provides information you need to delete sitemap in search console.
Steps to delete XML sitemap from Google Search Console
On the right side of the screen, select sitemap.
Click on the sitemap you want to remove.
At the top right, click on the three dots and choose remove sitemap.