Explain the problem as you see it
I often have three panels (docks?) open side by side, and I often also want to close the leftmost one. However, this is not possible. This is probably because Tana assumes that the other panels are for deep dives and I'm mainly working off the leftmost main panel. This is usually not the case.
Why is this a problem for you?
To close the leftmost panel, I actually need to full-screen the middle panel, then navigate to the rightmost panel again and open it up in a new panel. This is very cumbersome.
Suggest a solution
Options
1) Closing the leftmost panel makes the middle panel the main one.
2) Tana doesn't make a difference between "main panels" and docks but treats all panels equally.