In Java you are able to bind a key to swap your shield / totem to the offhand easily. However, in bedrock this is not a vanilla feature. Luckily, this addon fixes that and allows you to offhand swap items.

To use the swap feature in this addon, use the interact button. This depends on your device:

Mobile

Xbox

Playstation

Nintendo Switch

PC

Offhand Swapping

Support Discord: https://discord.gg/MkZvqTHHBA