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Guilherme FossalussaGuilherme Fossalussa 

How do i disable the feed in a custom object?

SandhyaSandhya (Salesforce Developers) 

From Setup, enter Feed Tracking in the Quick Find box, then select Feed Tracking.
Select an object for which you want to disable feed
Unselect Enable Feed Tracking.

Refer below help article.
Please mark it as solved if my reply was helpful, it will make it available
for others as a proper solution.

Best Regards,
Ajay K DubediAjay K Dubedi
Hi Guilherme,

Please follow the below steps.

Step-1) In the setup page in Quick find box search "Feed Tracking".
Step-2) Select your custom object from left sidebar.
Step-3) Uncheck the "Enable Feed tracking" option for that particular layout.

Please find the screenshot below.

User-added image

Please select as best answer it helps you.

Thank You,
Ajay Dubedi