How to delete the software on the horizontal line of HarmonyOS system toolbar?

A friend found that after the mobile phone was upgraded to HarmonyOS system, when the sidebar was called up, two applications would appear at the top. You can add the same application when you enter the editing state, but the above application cannot be deleted. What happened?

How to delete the software on the horizontal line of HarmonyOS system toolbar? The software on the sidebar horizontal line of HarmonyOS system belongs to the recommended application part, which is used to display two recently used non-resident applications. The recommended application does not support editing or deleting.

In the intelligent multi-window application column of HarmonyOS system, a recommended application section is added, which is separated from the resident application section by a horizontal line to display two non-resident applications you have used recently for your convenience. The system recommends applications for you according to your usage scenarios and habits, and the recommended applications do not support editing or deleting.

Intelligent multi-window comes from intelligent split-screen upgrade EMUI 1 1, which is a convenient small window function that supports multi-task parallelism and improves use efficiency. It can help you to view and reply to the email more quickly without interrupting the current content. In addition, the intelligent multi-window also supports opening multiple small windows, and the application can be switched at will through the floating ball, which is efficient and convenient. Up to 3 windows can be opened on the mobile phone, including 2 application split screens and 1 application floating windows. Tablet and folding screen can open up to 4 windows, including supporting 2 application split screens and 2 floating windows.

Taking Huawei mate30pro as an example, this paper applies it to HarmonyOS System 2.0.