Hi @Bui Hoang Minh, changing these fonts is a bit tricky, but here is how to do it:
Open Theme Manager in your Editor (here is how to open it) https://support.wix.com/en/article/wix-editor-working-with-text-themes
Open Text themes
Change Paragraph 2 in order to change these words for mobile view.
Let me know how it goes or if you have any question!