The Current button state is designed to highlight the currently playing audio track, subtitle track or movie
chapter (episode), the 3D state, the sound FX state or the values of GPRs 1-5 in a menu. To show this state in the
Designer window, click the
button on the toolbar.
An image (text/rect) assigned to this button state is shown only if the condition in the Highlight section is true:

Highlight if - specifies what the highlight refers to: the audio, the subtitles, the movie chapter, the 3D state or the sound FX state.
... in group (... in Movie) - the group/movie the highlighting applies to. Read more about groups here.
... is equal to - the audio/subtitle track number (index), the movie chapter, the 3D or sound FX state, or the value of GPRs 1-5. For the audio, the subtitles and the movie chapter you can specify several values separated by commas.
Chapter 1 (play mark)you have to use the number 2 for chapter 3 here.
Chapter 2 (link point)
Chapter 3 (play mark)
For example, suppose we have a movie "Movie 1" in a group "Movie Group 1". For the button that activates audio track number 1 we provide the appropriate image for the "Current" state and fill in the values of the Highlight section:
As a result, when you enter this menu and the current audio track is 1, the image specified in the Current state appears on the screen.
Each highlight condition can be assigned to one button only, i.e. only one button can have "Highlight if [Audio] in Group [Movie] is equal to 1", only one button can have "Highlight if [Audio] in Group [Movie] is equal to 2", and so on.