Minecraft Bedrock Edition not showing block hitbox?

I opened up a Minecraft bedrock edition video and saw this

In minutes 0:35 to 0:38 you can see that he can build very quickly and sees a white hitbox. I also have Minecraft bedrock, but I see the blocks like in java Minecraft, so I don't see a hitbox.

Do I have to activate this somehow in the settings?

For this you have to activate "frame selection" in the graphics settings

Thanks, I can somehow use your plugins too

Plugins are only available for the Java Edition

This frame selection was already on, it doesn't work