To change the behavior and to open the link in a new window you will only need to add one string to the code of any of your templates.
The string is target="_blank".
So for example, your link may look like this:
HTML
<a href="https://www.website.com/">Homepage</a>
And after you add the string it should look like this and once the link is clicked, the page will open in a new window:
HTML
<a href="https://www.website.com/" target="_blank" >Homepage</a>