How to mine down?

Kind of a stupid question, I guess, but I can’t the game to designate mining downwards in the current version. The tooltip says to click and drag, but that only goes horizontal. I haven’t been able to get it to go down yet at all.

Anyone else having this issue? Or am I just doing something wrong?

mine top layer until finish and then create another layer after top layer is opened.

this is where ladder is useful.

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