LTSC Outlook Mac not having New Outlook

Hi All,

We are a hybrid exchange environment and a region's mailboxes are not migrated to cloud. When we deployed Microsoft 365 version of Office to theses users, while configuring Outlook for some strange reason they were pointed to Office365 instead of Microsoft Exchange and upon investigation we finally decided to deploy LTSC version of Office. Post which they were pointed to Exchange and since then they are using this version.

The issue now here is, in this office version the users are not able to switch to New version of Outlook in Mac, when i was googling i found that we can actually enable users to switch by setting preferences as seen here:

https://learn.microsoft.com/en-us/deployoffice/mac/preferences-outlook#enable-new-outlook

The issue is, where do we run this command and how do we set this?