Origin Ver. and Service Release (Select Help-->About Origin): 9.7.0.188 Operating System: win 10 64
How the graph looks in the program: How it looks when I export it: I tried different resolutions and file types and I tried making the dotted lines thicker but nothing helps
This problem is similar with an known issue(ORG-21161) which has already been fixed in Origin 2020b.
Maybe you can send us the project file to let us check the details, via tech@originlab.com Please remember to quote this post in your message. Or, you can download our Origin 2020b trail, if your license doesn't support to upgrade to Origin 2020b, to have a try by yourself.