It is possible to remove multiple post in your WordPress dashboard. You can also remove selected posts with just a few clicks.
1- Login to your WordPress admin dashboard.
2- Under the dashboard menu, hover your mouse over Posts and click on All Posts.
3- Tickmark the top checkbox and all checkboxes will be automatically selected.
4- Now click on Bulk Actions and select Move to Trash from the drop-down menu. Then click on Apply.
It's done. Your posts are removed and no longer available for public view.