The home feed tuner gives you a view of all your boards, the last 3 months of your activity history and the topics you follow. You can turn any of these on or off to improve your home feed recommendations.
Recommendations are automatically turned off for archived boards and secret boards. Your secret boards are labelled with a lock in the home feed tuner and you can turn recommendations from your secret boards on at any time.
Turning recommendations on or off won’t affect the ads you see in your home feed. You can limit the information Pinterest uses to pick which ads you see.
Switch between the Boards, History or Topics tabs to turn off recommendations based on any boards or unfollow any topics used for recommendations. You can turn off recommendations from your recent activity in the History tab by selecting the Pins you don’t want to get recommendations from.