Setting up Heading sizes

How can I get control over the heading sizes when they change in tablet and mobile when I change them in web. (I mean the text themes, not just font size changing)

F.ex: I want 36 for H2 in web, and 25 for H2 in mobile. But when I set 36 in web, it automatically changes mobile to 25, and if I set mobile to 25, it changes web to 86.
Product:
[Which editor or feature is your question most relevant to? e.g. Wix Editor, Wix Studio Editor.]

Set a range(Max and min value) in font style. The highest font size will be for your highest breakpoint(desktop) and the smallest size will be for the mobile. All breakpoints will have the size between the range.