How to turn off the push message of the app?

We need (3 steps) to operate how to close the push message of the app. The model of this demonstration is Vivox 60 Pro+; System: origin OS 5.12; The following are the detailed steps:

1 Click Application Management.

In mobile phone management, click Application Management;

1. Click Application Management2, and then click the floating window.

After entering the page, click the floating window;

2. Click the close button of floating window 3.

Pop up a new interface and close the button on the right.

3. Close button