@Mehrad@Tutanota
TUTA FOLDER DELETION 1/5:
A folder that is deleted containing at least one message is moved to a Trash subfolder, selecting "Clear folder" to permanently delete individual messages in the Trash folder does not affect the subfolders.
When a folder is deleted and moved to a Trash subfolder, the Trash icon changes and a plus sign appears in the lower right portion of the icon.