: Many users miss the underline button because it's hidden. Click the "hamburger" menu (three lines/dots) in the corner of the Character panel and select Show Options .
A trendy design choice is the "highlight" underline—a thick bar of color behind the text. illustrator underline text
Happy Designing!
If you're looking for more creative control or a specific effect, you could use a Brush to create underlines. : Many users miss the underline button because it's hidden
Always remember to ( Ctrl/Cmd + G ) your text and your custom underline shapes together once you are happy with the alignment. This prevents your beautiful typography from falling apart if you move the text box later! illustrator underline text