/force_item_into_offhand command (Bedrock)

This command can be used in survival without cheats, usable at any permission level. To use the command, you are only required to simply type it in.

When you run this command, one of 4 things may happen:

• If you run this command while you only hold a main-hand item, your existing main-hand item is transferred to your off-hand slot.
• If you run this command while you hold a main-hand item and an off-hand item at the same time, the items in your main-hand and your off-hand get their position swapped.
• If you run this command while you only hold an off-hand item, your existing off-hand item gets transferred to your main-hand. 
• If you run this command while not holding anything in either of your hands, nothing will occur.