If you want to work on a single node in a second view, the Freewin plugin will do that. You can open a Freewin window on any node, and each FW window will remain locked to its node, so you can arrange several of them along with the main Leo window. The Freewin window contains a text editor - not a full-fledged Leo body editor but still useful - and changes in the FW window get incorporated in the parent's body, and also changes in the parent get reflected in the FW window.
In this way, you can navigate in the tree as usual, while being able to keep looking at and editing any particular nodes you are interested in.
Otherwise, I mark nodes of interest and jump between them using these Leo commands and shortcut keys:
goto-next-marked = F4
mark = F9 # This is a toggle command
unmark-all = F10
I don't like add-editor because I always lose track of what node an added editor is looking at - it will change as you navigate the tree if it is focused at the time. I always end up typing into the wrong node. FW avoids that problem.