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let say I am using 2 interface for my front panel, one as the main screen(to let the user chose the mode) and the other as one of the mode selected by the user. is it recommended to hide/display the interface or is there another efficient way to do so?
There are several different ways to implement the user interface necessary for your application. One alternative that would allow you avoid hiding and showing front panel controls is to have the main VI call a SubVI that has the user interface for the mode selected by the user. By setting the VI's window appearance to "Dialog" under File>>VI Properties>>Window Appearance the VI will display its front panel when called, and then close after it finishes running.