- Open the Withings App.
- Go to Devices.
- Tap the scale you want to dissociate all users from.
- Scroll to the bottom of the screen.
- Tap Dissociate this product.
- Tap Remove from all other accounts.
All separate users will be removed from the scale.
https://support.withings.com/hc/en-us/sections/6216069138705-Withings-App-iOS
https://support.withings.com/hc/en-us/sections/200501488-Tutorials