When you create a profile, the default lines are thin and hard to see. If you make them thicker, it can look great. But you cannot save these changes as a default, AND (my favorite part) if you change the profile time step or play the profile the lines instantly revert to the original settings. I submitted a bug but was told this is not a bug and was the intended implementation.

My suggestion is to "lock" changes to a given profile AND to make these changes part of the default if the user clicks the "save as default" option. A user should not have to repeatedly change line settings if they, for example, want to capture a few different snapshots of the same HGL profile.