Hi
You should set up different profiles (aka identities) for your different accounts.
Outlook profiles/identities
Each Identity is a folder, except that Identities are now called “Profiles” and the Profile folders are not in the Documents folder.
Profiles are folders in the hidden Library folder.
In Finder, press Shift+Command+L to display the hidden library folder.
Office 2016, 2019 and 2021 PROFILE LOCATION
/Users/UserName /Library/Group Containers/UBF8T346G9.Office/Outlook/Outlook 15 Profiles/
There is an app that lets you set the default Profile for Outlook to use. Here’s how to find it:
In the Applications folder, right-click on Microsoft Outlook.app
From the pop-up menu choose Show Package Contents
Open the Contents folder
Open the Shared Support folder
Drag the Outlook Profile Manager.app icon to your dock
Now you can run Outlook Profile Manager.app to add, remove, and set the default profile.