This feature requires the Salesforce integration to be set up. See Salesforce integration if you haven’t connected it yet.
How to enable exclusion
1
Open the Salesforce integration settings
Go to Integrations and click Manage next to the Salesforce integration.
2
Toggle on exclusion
Toggle on Excluding Salesforce objects.

There is a daily Salesforce API quota for each account. Once the quota is reached, both the Salesforce indicator and the exclusion feature will be disabled until the next day when the quota resets. To set your API limit, go to Integrations → Salesforce → Manage → API request limits.