Trying to sort Tasks in a report by numerical indentation levels

I am trying to sort tasks so that they are in order like the way i have typed out instead of the way its actually sorting as seen in the screenshot below. Any guesses on how to do this?

2.1

2.1.1

2.1.2

2.2

2.3

2.3.1

2.3.1.1

etc.

Answers

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