It is possible that you do not want to delete a blog article, but it must not be available online. Note that it is then possible to archive it. The blog article will remain accessible on the blog manager, but it will not be available online unless the user has the URL link.
To archive an article, go to the blog manager and click on the three points icon to see the list of available options.
In the list, you will find the option Archive. Click on it to archive your text.
To Unarchive an article, you just need to go to the Archived tab, click on the three-point icon, and click on the Unarchive option. The article will then go back into the Drafts. You will need to publish it again to have it available online.