No, Sunflower software can't directly monitor the computer secondary screen. Because sunflower software can only monitor and remotely control the main screen of the computer, but can't identify and control the auxiliary screen of the computer. This is because the computer secondary screen is not an independent device, but a virtual screen realized by the graphics card and the operating system. Sunflower software can only identify and control the main screen, but can't directly control the virtual screen of the operating system.

If remote control and monitoring are needed on the computer split screen, it can be realized by other remote desktop software, such as TeamViewer and Chrome remote desktop. These softwares can identify and control all the screens of the computer, including the main screen and the auxiliary screen. However, it should be noted that when using these software for remote control and monitoring, it is necessary to ensure that the resolution and display settings of the sub-screen and the main screen are consistent, otherwise the display will be incomplete or misplaced.

In practical use, it is necessary to select the appropriate remote control software according to the specific situation and set the screen resolution and display settings of the computer reasonably in order to achieve better remote control effect.