There might be two approaches for this. The first, which I think is the case here, is where the same banner is repeated on each sheet, but with the font color made different on the related label in order to represent where the user is currently navigating.
The other approach would be to set a variable, such as vOptionNb to a distinct value upon clicking a label. For example, when clicking on "Introduction", a trigger would set vOptionNb to 1, when clicking on "Input Your Metrics", it would be set to 2, etc. Then, for each label, you would define the Font color as an expression such as If($(vOptionNb)=1, Yellow(), White()), and so on.
Hope this helps, regards,