How to collapse deep child blocks too automatically?

Questions & Help
1

I want to print but should I expand manually each child block or is there a shortcut for this?
Note: I tried Ctrl+Shift+A then Ctrl+Down but this only expanded 1st children only. I need deepest children nodes too.

2

is there a shortcut for this?

Yes, use t o (toggle open) in viewing mode.

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