Rod of Thick Black Line

I am trying to get rid of thick black line in Micro Soft Word

This site is dedicated to LibreOffice. If you have a problem with M$ Office, post on an appropriate site.

If your problem is about documents created in M$ Office and processed in LibreOffice, edit your question to better explain what happens.

You tagged your question common: this means here the issue occurs in Writer, Calc, Impress, Draw, Base, and Math. If you target a specific application, please retag the question with the appropriate tag: writer for text documents, calc for spreadsheets, impress for presentation, draw for drawings, base for database access, math for the formula editor.