When can I mine everything at once?

In Minecraft Volcano Block, for example, I want to break down the whole obsidian at once.

Which key do I have to press / hold?

Can someone help me?

Do the command.: / fill (coordinates X, Y, Z,) (coordinates X, Y, Z,) (obibold block)

Ne do but without

As survival?

If so, then I know myself there!

Yes

With my boyfriend

Ok then take a request!

You just have to hold down the Ore Excavation key when dismantling. Which is that you have to look in the options.

How hot that

The mod is called Ore Excavation.