Whilst going through Idioms in one website, I found the meaning of the Idiom - 'All Sixes' as:

All sixes
If something is all sixes, it doesn't matter how it's done; it's the same as 'six of one and half a dozen of the other'.

Can anyone please explain me what does the second sentence - " it's the same as 'six of one and half a dozen of the other' "?
I am not familiar with the idiom 'all sixes', but I am familiar with the idiom 'six of one and half a dozen of the other', which means 'it doesn't matter how it's done'.
I'm not familiar with the expression "all sixes" either.

I've heard "at sixes and sevens ", however. That means "in a confused, badly organized or difficult situation".

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Since a dozen is twelve, half a dozen is six.  So "six of one, half a dozen of the other" means the two things are equal or equivalent.
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If you have six (6) of item "A" and half a dozen (6) of item "B" , you have the exact same amount in either scenario. So to say "it's sixes" or "it's all sixes" you are comparing two items and stating they are virtually the same.

For example: If I were comparing two products I wanted to buy, and product "A" had a very similar feature set as product "B" I would say "it's sixes either way"