Snapchatters may appear in your Quick Add for a variety of reasons, like if you share a mutual friend on Snapchat, if someone’s a new contact in your address book, or if you share another connection.
Quick Add most commonly appears in the Add Friends screen. If you’d like to remove someone from your Quick Add list on that screen, simply swipe left on their name and tap 'hide.'
If you’d rather not appear in Quick Add for other Snapchatters, follow these steps:
Tap on your Camera Screen.
Tap to open Snapchat settings.
Scroll down to ‘Who Can.. See Me in Quick Add’ and toggle Quick Add off.
You should no longer appear to any Snapchatter in Quick Add.
Please Note: If you toggle off 'See Me in Quick Add,' the change may not take effect immediately.