Indicator margin
If enabled, the editor shows area on left side of text editor view for indicators (markers) like:
- Bookmarks
- Breakpoints
- Execution Position
- Scope Exits
- Found pointer etc.
The option can be enabled as for specific document, via menu View→Editor (file specific)→Indicator Margin or for all documents of specific syntax.
Right mouse click on margin shows Bookmark menu. Left mouse click + Ctrl sets an unnamed bookmark.