HTC ONE M8 Font changes (white font and black edging)

[AC Question]

I realise this question has been asked several times before on the internet but I can't find an answer to my query. Using Android 6.0 & Sense 7.0 and unable to change the secondary font. What I mean is the font for menu titles. It's the font with white colour and black edging. My eyes aren't the best and this font is very hard to read. I can change the normal system font but this black edge type font doesn't seem to have an option to change it. Find it puzzling how HTC have let us change the system font but not this other one.

Can anyone maybe help please or am I stuck with it?

TIA