I am new editing and it is my first message.
Editing the map, I see that there is no source that is badly located. I see it in the final map compiled, but I do not see it in the editor.
Below I see that it indicates “… hidden elements”. How can I see them to modify one of those elements ?. I search but no found info about this.
Do you mean this maybe ? → https://wiki.openstreetmap.org/wiki/JOSM/Plugins/Notes
Maybe he is talking about iD online editor.
Just zoom in to see all elements. The editor hides some elements in higher zoom level to improve performance.