First check Pin/Unpin option, then go to the bottom right corner of the revit interface and unchecked the link, underlay, unpin options.
Hope this will work.
Thank you so much... It was an easy solution!!! 👍
Thank you so much! It was an easy solution!!!
I encounted the similar issue but couldn't click on the Reference Line to unpin the line. It became freeze/hard to delete the line.