"Bad Request - Request Too Long HTTP Error 400. The size of the request headers is too long." Microsoft Word showing error when inserting watermark

1. Open Word

2.Click on File Menu

3. Click on "Options"

4. Under "General" options click on privacy and settings

5. Under "Optional Connected Experience" and uncheck " Turn on optional connected experiences"

6.Click on ok -----> ok. Restart the word.

7. Click on work offline. Now you can select picture for watermark.