See if you have 'Sync Emails with the CRM' setting enabled
By disabling the connector setting Sync emails with the CRM, that will prevent Account Engagement emails from syncing over as completed tasks in Salesforce under Activity History.
Instead you're able to add the 'Account Engagement Activities' Visualforce (in pi.pardot.com) or 'Engagement History' component (in Account Engagement Lightning) to see this relevant Account Engagement data.
A few things to keep in mind before disabling the Sync emails with the CRM:
Note: This information also applies to the "Sync Engage emails with the CRM" and "Sync plugin emails with the CRM" settings. Be sure to review those as well.
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