Clear cookies in Safari on Mac
You can see all the websites that have stored cookies and website data on your Mac, and you can remove some or all of it.
In the Safari app on your Mac, choose Safari > Settings, then click Privacy.
Click Manage Website Data.
Select one or more websites, then click Remove or Remove All.
Removing the data may reduce tracking, but may also log you out of websites or change website behaviour.
Note: Removing cookies and website data in Safari may change or remove them in other apps.