I have an outliner panel and it’s locked in place and outliner selection is set to other panel. If I accidentally double-click the icon on a document/folder it instead unlocks current panel and opens it instead of the other panel. How do I make it not do that?
(Sorry for phrasing, recently had small stroke and it makes words hard.)
The action you are taking, of double-clicking on an icon, is always going to load the item in the view you started in, not over in the other split. That is a core behaviour. If you want to load something in the other split, you either need to drag it to the other split’s header bar, or use the shortcut for Navigate ▸ Open In ▸ (Other) Editor. The name changes on the command, but the shortcut for other editor is always the same.
Locking the editor doesn’t stop you from intentionally navigating yourself (we found it was very frustrating in tests when it worked that way). It only stops external incidental navigation, like clicking in the binder, or when one split is set to automatically load the selection into the other split.
So to answer your question, there is no way to tell the software to not do what you just told it to do. 