I’m trying to wrap around my head why your workflow is so conflicting with the changed UI in DT3. You’ve explained some of it, so it could certainly be just me who doesn’t really understand the necessity of the three panes in your situation. As such, I don’t mean to disrespect that situation with this comment. I simply don’t get it.
The reason I ask is one of the quotes that @BLUEFROG posted in that compex thread mentioned by @Blanc and to me stood out from all others:
In others words: the 3 panes in DT2 for you are obviously a tool to achieve some goal. It can be hard to change a habit or a workflow, but could another approach be to rethink that workflow?