When you insert a link in a Text or Title block in an email, that link is automatically underlined. Here are some methods to remove the underlining and to manage the link styles.
In a Title block
Go to the Styles tab and check the U icon:
In a Text block
Go to the Styles tab and check the U icon:

For the whole message
In the Global configurations, you can change the styles, including the styles of the links, for the entire message:
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