It is possible to remove multiple post of Website 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 post is removed from Website and no longer available for public view.