How to remove "sample" text

Hello. When opening a .docx file there is the word “sample” in grey diagonal text across the background of the first page. How do i remove this? Thanks.

Which OS and which version of LibO???

But let me make a guess:
Format > page > background > as > select Graphics and remove the link

It could be that this is also in your default page style. Check:
F11 > page styles > default > right click > modify > background > as > select Graphics and remove the link > OK

Could you upload a sample?

Try CTRL+click | Delete