Tree panel should work in three modes:
The default mode: The cursor
can be moved independently and does not affect the opposite panel. Pressing Enter opens the directory under the cursor in the opposite panel. Copy and Move operations from the opposite panel are targeted to the current directory on the tree
Quick view mode Switchable with Ctrl-Q. This mode is similar to the behavior of Windows Explorer movement of the cursor opens the directory under the cursor in the opposite window. Mostly used for quick traversing of the directory tree in a mode similar to quick view with directories opening as we move the cursor
Information mode (Ctrl-L). Similar to quick view mode. But in this case the movement of the cursor on the tree panel opens not a listing of files in the directory but the information window should be shown that calculated statistics for the directory (number of the files, total size, number of subfolders, attributes, owners, etc)