Text Colour Change Required on Tab Engagement

Hi

I would like to be able to change the colour of the text on my tabs in my Tab Engagement to Black rather than white

I've tried going to Colors and then amending my colour scheme but under Tabs I'm only offered Background or Slide Background

I cannot see anything in the Player Template either - when I look at my tab colours on that I have them set to black already

Do you know where I might be going wrong?

Screenshots attached

thanks

Sarah