Hello,
Global font settings you can find in Theme Options > Typography > Body and Headings font. Footer and header inherit font family that you set there or if you use the Elementor version then font of footer elements could be set/changed in the Typography settings of every element, for example https://www.awesomescreenshot.com/image/24864050?key=489cbf1d3fdbf998f0c087cfac28bcea
Regards