Hello!
Thanks for the great question. All of the default colors, including links, are controlled with the Customize -> Colors menu. This helps make sure that your text and backgrounds are always consistent with each other and matching your business’ color scheme.
If you want to get more control over the link styles, especially if you’re looking to modify the hover style, you’ll want to use Custom CSS in the Customize -> Advanced -> Custom CSS & JS menu.
For example, if you want to make sure that all your links are always underlined, you could use custom CSS like this
a, a:hover {
text-decoration: underline !important;
}
I hope this helps!