Wechat has become smaller because a floating window is set in the new function. You can directly enlarge the window or close the floating window in the settings. Method of setting mobile phone suspension window:

1. Please open the floating window of the application (Settings → Application → Micro-encryption → Check the floating window).

2. If the mobile phone is Xiaomi V6 system, please turn it on in the security center (security center → authorization management → application authority management → application management → micro-encryption → floating window box).

3. Huawei Honor has no floating window. Please find the mobile phone housekeeper that comes with your mobile phone, then find notification management, micro-secretary, micro-secretary and WeChat, and select Allow.