https://vitalvegas.com/le-reve-rumor...ently-at-wynn/

Le Reve was a knockoff of Cirque's "O", and takes place in a million gallon tank. It was generally well liked, and ran for 15 years. The theater cost $75 million to build.

It is closing because there is no date in the near future when shows will be allowed to resume, so they decided just to give up and shut down. While it is "permanently" closing, it is possible that the show will reopen at some point in the future, even maybe at another casino.