Since a week or two, we're able to get the old sidebar back, but you need to switch to the Accountant View. The Business View still shows the new horrible sidebar, but the Accountant View is back to the previous working sidebar. I believe it was supposed to be that way since the day they added the new sidebar, but for some reasons it didn't work.
At least now, we have the choice!
Also, the bookmarks will continue working for both the Accountant and Business View, and it's still possible to hide useless navigation items (such as Marketing) as well.
For those wondering how to switch between Business and Accountant View, check the following link: https://quickbooks.intuit.com/learn-support/en-us/help-article/chart-accounts/switch-business-accoun...
