click in the paragraph above the line, /Format /Paragraph : Borders tab, and remove the bottom border that it will show.
This advice from the link I posted above should remove existing solid lines added via the "three stars" method. Of course, you need to do that individually for each solid line inserted.
In future, can you please not ask the same question in more than one topic - it fragments discussion and may result in the question being answered the same in several places by several people.