It did nothing of the sort. In fact, the instructions from Barr in his memory, which they fought tooth and nail to keep private and was released the same day as the report, basically just said "he's the president you can't charge him'. Mueller laid out ten scenarios where obstruction would have been on the table for anyone but the King of the US. Everyone else is subject to trial and conviction based on reasonable doubt, but you'd like him to be standing over the dead body of this asset.

https://www.nbcnews.com/politics/politics-news/hundreds-former-prosecutors-say-trump-would-have-been-indicted-if-n1002436