Please, stop SHOUTING
You can't revert back to the old style layout on Cloud, Cloud users are stuck with the left-hand side bar now.
If it is important to you, then you should migrate from Cloud to Server - the new layout does not look likely to go to Server for a long time. (For which I am glad, because I think I like the Cloud layout just as much as you do! I really don't think it's ready to go to the users yet)
I find the new layout to be a big mistake. I can not feasibly run Jira Server, as I have Jira for a board and the board will most certainly not always have someone competent enough to administer the server.
The ideal solution would be for Atlassian to give you the option, or simply go back to the old design, not force people to use server version or have to use a third party for administration.
It is simply a weird design choice on Atlassians part. Time to kill whoever's darling this might be.
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