This application provides a window display method, a window switching method, an electronic device, and a system. The method is applied to multi-screen collaboration between a mobile phone and a PC, and a plurality of application interfaces of the mobile phone are displayed in a form of tabs in a multi-screen collaboration window. In the multi-screen collaboration process, a background of the mobile phone may obtain user operations, distinguish between operation objects according to the user operations, and then determine a running status of an application and a window display status, so as to obtain an operation result that better meets user's expectation. The method may further implement file sharing between the mobile phone and the PC and between different applications of the mobile phone.