1. Please Install this plugin. It's free and works fine with youzify
https://buddydev.com/plugins/bp-community-activity-on-profile/
2. Please go to Youzify Panel >> Profile Settings >> Tabs Settings. And then, please disable "Activity tab"
3. Please create a new tab on Youzify Panel >> Profile Settings >> Custom Tabs
4. Select Tab Type as "Link". And then ad this URL format
"yourwebste.com/members/me/activity/all-activity"
PS: For "members" slug, it depend of your Members Directory slug.