What does cyan marker indicate in the editor

I noticed that the editor in the 2020b version of Matlab will occasional show a cyan marker at the left side of a line.

I have searched but been able to find any explaination of this marker. Does someone have knowledge about this feature?

Best,

Mark

Answer 1

[Simon Chan]

Check this: Editor Bookmarks

[Mark Brandon]

Thanks a bunch. It is hard to search on the basis of the color of a button.