How to open the "other application management" of Xiaomi mobile phone?

First, we turn on the phone and see an installer. Click Settings.

After entering the settings, we drop down the page and see that there is also an application management. Let's click Other Application Management.

When we enter here, we will see all the downloaded applications in our mobile phone, and there is a default application setting in the lower left corner. Let's click on it.

Enter the default application settings, and we will see that all our settings are the default settings of the system. Here, we set up the email application, and then click email.

After entering, we see that there are two settings, one is the system default, and the other is qq mailbox. Here, we click to select qq mailbox. At this time, we saw an arrow in our qq mailbox. In this case, it means that our choice is correct.

Then we went back and saw that the qq mailbox was set here. At the same time, we noticed that there is a restore default setting at the bottom. If we click on it, all our settings will be restored to the default settings. We won't order now. Ok, let's start here.

Open the system settings and enter the system settings;

In the system settings, find other application management and click Enter;

After entering, find the default software for opening files, click Enter, and then click Clear Default Settings.