Quickly Access Pinned Chats
Pinned chats have come to both iOS 14 and Big Sur, and in addition to letting you keep your favourite conversions prominently at the top of your message list, they also offer another particularly handy trick.
You can quickly switch between your pinned conversations by holding the CMD key and tapping a number. For example, CMD+1 will give you the first chat, CMD+2 the second, and so on, right up to CMD+9, which is fine because you can only have nine pinned chats anyway. This also works on the iPad if you’re using an external keyboard.