One way to delete a watermark from your Word document is to use the Watermark menu. This is the menu that you also use to add watermarks to your documents.
On the Word screen, in the ribbon at the top, click the “Design” tab.

On the “Design” tab, in the “Page Background” section, click “Watermark.”

From this menu select remove watermark.

And Word will delete the watermark from your document.

The other way to remove a watermark in Word is by editing the header.

In Word’s ribbon at the top, click the “Insert” tab.

On the “Insert” tab, in the “Header & Footer” section, click “Header.” You can use the “Footer” option, too, if you want.

In the menu that opens, at the bottom, click “Edit Header.” Your document’s header is now editable, giving you access to the watermark. Find the watermark you want to remove in your document and click it.
While your watermark is selected, press the Delete key on your keyboard.