Font sizes and item vertical distances

I find the default font sizes and vertical distances of placed elements way too large for the a phone app. Is there a way to scale all UI items down by a factor? Using Ionic5.

I would guess the default font size on a iPhone is ~10pt max while its ~12pt in the framework.
Hence I would like to apply a constant factor to all UI components that all are reusable and behave the same way as they should.

Does this make sense?