Force Folder-Tree not to shift

Following situation:

left window panel shows E:\ drive and folder tree.

When I wish to copy/move a file using drag+drop and whilst pushing
the RMB and move down the folder tree, folders expand, rightfully so.

This is all going well as long as the folders in the left window panel
are still E:-drive folders.

However, if F: or G: etc. are entering the bottom of the left window
panel, the tree shifts to the left and left until the entire tree disappeared.

Is it possible to fix the position of the tree, so that it will not shift to
the left.

I have not found any setting to that effect.

thank you
(see examples - the top one: tree disappears to the left, bottom one, how i want to have it, fixed, no shifting)