One of our users that’s been trying out eM Client would like to see a relatively simple option added to the client: The ability to disable folders from auto-expanding whenever you drag and drop a message between them.
Currently, whenever you move a message between folders, it expands the subfolder list of the folder you dragged it into, which just gets in the way. If you want the list to expand before dropping the message to place it into a subfolder, you can always just hold the message and hover over the folder.