The method to enable spectator mode in Minecraft Bedrock Edition is to enter spectator mode through toolbox and other auxiliary tools, create a map in the game, open btr to operate, find "playergamemode", change the data to 3, and enter the game.
Detailed answer:
Spectator mode was added in 1.8. When you are in spectator mode, you can move through blocks and enter the perspective of creatures by left-clicking on them, but you are invisible to all creatures except other players in spectator mode. You can't interact with any blocks, entities, or inventory items, and when you're in third-person mode, you look like a floating transparent head. Unlike flying in creative mode, you can adjust your flying speed using the scroll wheel.
Players who are not in spectator mode cannot see players in spectator mode, but players in spectator mode can see other players in spectator mode, but only the heads are visible and are translucent. Bystanders are not paid attention to by creatures, and will not trigger the creation and disappearance of creatures (including monster spawners). Spectators affected by the glowing status effect will still be visible to other players in spectator mode, but will remain unnoticed by mobs. If changed to Default (None), spectators can use the "Highlight Player (Spectator)" option.
*Players can also enter spectator mode through auxiliary tools such as toolbox
Create a map in the game
Open btr for operation
Find "playergamemode" and change the data to 3
Just enter the game.
renderings
Note: The so-called "spectator mode" of Bedrock Edition is still under development, is extremely unstable, and is not recommended for use.