6.5.2   Exit from Windows Title Bar (Close Window)

If the Windows Title Bar is enabled, click on the X at the top right of the Window.

Figure 6.20 Windows Title Bar CLOSE WINDOW

This is the same way you close windows programs. 

Or use the menu from the Taskbar Icon.

Figure 6.5.2 - Title bar Icon menu - ViewDAQ

Move the mouse over the ViewDAQ Icon to open the menu.

Note - It is possible the Display Group is configured to hide the Windows Title Bar (Popup Window Without Title). 

A similar Title bar menu exists in web browser Display Groups.