To unbind an app to a WeChat account, just unbind the authorization management in WeChat. The specific operation details are as follows:
1. First, find and open the WeChat app on your phone.
2. Select "I" - "Settings" at the red arrow on the WeChat page.
3. Next, select "Privacy" on the page where the red arrow points.
4. Select "Authorization Management" at the red arrow on the page.
5. Select "Manage" at the red arrow on the page.
6. Finally, select the app to unbind and click Delete.