The reason for Windows to disappear (hidden) is reduced in linux.

Symptom: in linux, why does the window disappear (hidden) when it is reduced? You can only press "ALT + TAB" to call it out and view it again?
Solution:

Right-click "Panel" (windows is called the taskbar, linux is called the Panel) -- add to the panel -- window list -- add,

In this way, the window is displayed on the panel. Specific Operation: www.2cto.com

Another problem is that you know how to add it, so how can you not see it before? The reason is that you can delete the panel. For example:
From the column dajiahaowolailele