To show or hide the Sidebar, click the Acrolinx tab.
If you can't see the Acrolinx icon and you're sure that your Microsoft 365 admin has installed it, follow these steps:
Click Office Add-ins in the INSERT tab.
Click ADMIN MANAGED.
Select Acrolinx for Microsoft 365 Online.
To change your Acrolinx URL, you need to sign out and sign in again. Sign out from the slide-out menu in the Sidebar.