To change the font family of a component, follow the below steps:
1Select any component that has text like Button, Label, Text,...
2In its component settings, select 'Font' to bring up the 'Font chooser' dialog box.
3In the font dialog box, select from built-in fonts / Google fonts to change the 'font family' of a component.
4To change the 'font family' of another component to the already used 'Font', select the 'Used' tab in the font dialog box. This helps to select fonts only used already in that project.