Hi,
We can close Outlook, go to Control Panel > Mail, click Email Accounts... button, click to select your IMAP account and click Change... button, this should show the advanced settings you want.
If you prefer the older, familiar dialog, we can turn off the simplified version and revert to the older Add Account dialog by editing the registry. Please refer to the details
in this link.
Hope this is helpful to you.
Regards,
Perry
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