How to open Huawei p30 suspended window?

Step 1: Turn on Huawei's mobile phone and click the phone settings on the desktop. Step 2, click Apply in the phone settings; The third step is to enter, and then click the rights management; Step 4, enter the application authority management, click the authority and select the floating window; Step 5, enter the floating window permission, find the application with permission to open the floating window, and start.