What is this blue frame in Creative mode?

[Melange]

Playing in creative mode (debug mode also on). I didn't mean to, but I pressed the Z-key and a bright blue frame appeared. Thinking it may be a toggle, I pressed Z-key again, and the frame doubled in size. It wouldn't go away until after exiting the game. What is that used for?

[Deverezieaux]

That's the selection box for building. Pressing Z selects what you're targeting with that blue box. If you press Z again while pointing at another location the selection will include everything from the original selection to your next selection. It can be a useful tool in creative if you just want to have fun building. You can use G to drag the selection, CTRL+G to resize, Shift+G to select an existing block, etc. There are many other controls I won't get into here. If you'd like to learn more about using this to build there are some good tutorials out there like this one:

 

 

[RyanFaeScotland]

1 hour ago, Deverezieaux said:

There are many other controls I won't get into here

 

Please go into how to deselect altogether!

[zztong]

2 hours ago, RyanFaeScotland said:

 

Please go into how to deselect altogether!

 

In the Prefab Editor deselect is the Backspace key. Maybe that's what it is when it appears in other environments.

[Deverezieaux]

Yes indeed, it's the same in creative/debug as the prefab editor, backspace deselects.

[Melange]

Thanks everyone. Knowing this, I'll play around with it. A little knowledge is a dangerous thing 🧐