I made an exapmle workaround for an idea https://community.filemaker.com/ideas/3128?commentID=43648#comment-43648
Sliding option "Fit to enclosing part height"
I can't attach file to idea so make this post.
As you can see, this doesn't show vertical line in browse mode.
Before I post this, I noticed
- The line can be in body (move 1 pt down)
- The dummy sub-summary and grand summary part aren't need (delete the parts)
Applying these, the line become "boby to footer" and it does not appear in layout background and footer. Good.
Then I found another post which already did it