In the colour property of your icon and label use the following (edit for your app)
If(App.ActiveScreen = Support, RGBA(255, 0, 0, 1), RGBA(0, 0, 0, 1))
This will set the colour of the text and icon to red is the support screen is active. if a different screen is active the text and icon will be black.
If this solves your issue make sure to mark as accepted solution.