To show or hide the Sidebar, click the Acrolinx icon in the REVIEW tab.

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