It is possible to remove multiple posts in your WordPress dashboard. You can remove selected posts with just a few clicks.
1. Log in to your WordPress admin dashboard.
2. Under the dashboard menu, hover your mouse over "Posts" and click on "All Posts".
3. If you want to remove all posts, tick the top checkbox and all checkboxes will be automatically selected.
If you don't want to remove all posts but a select few, do not tick the top checkbox, but rather tick each checkbox individually, next to the blog post. This advice applies to Pages as well.
4. Now click on "Bulk Actions" and select "Move to Trash/Bin" from the drop-down menu. Then, click on "Apply".
And, you're done. Your post is removed and no longer available for public view.