Better control of symbol for links in new tab or window

The Hueman theme displays a symbol/icon after a text link that will open in a new tab or window. This is good. The problem is, even if a link is manually configured to open in a new tab/window, if the link includes my domain, the symbol doesn’t appear. I don’t tend to use new tabs/windows for internal links, but the theme omits the symbol when I link to another site accessed via a subdomain, e.g. photos.albj.net – and even more to point, the Bluesky social media platform can be configured such that my domain is my username, so my bsky link of https://bsky.app/profile/albj.net also does not display the new tab/window symbol. (I currently have temp worked around this by putting my bsky link behind a bitly shortlink. My skill level is probably only just around amateur with doing custom tweaking. Wondered if maybe there’s some custom code I can add into the Additional CSS section or any other simple fix to be able to override and show the symbol on links that have ‘albj.net’ in them.

The page I need help with: [log in to see the link]