How does one move on from the following message in Gmail in yellow background?

It says:
“Be careful with this message. Someone may be trying to trick you by using similar looking characters in their email address. For example, replacing the letter “O” with the number “0”. Learn more”

Once you make sure the email address looks fine, then what? How do you remove the message and move on to composing? What would indicate to Gmail that you’ve read it and that you want to continue with composing?