Half Life 2, released in November 16, 2004 was a ground breaking game in the gaming world, however as with time, things age, Valve recently has shown that Half-Life 2, along with Half-Life: Source and couple other Half-Life games are getting a new user interface! This is somewhat similar to what they achieved with counter strike global offensive already. However, it is not currently confirmed if the new UI will only display if you are using Steam Deck or if it will also display when using mouse/keyboard.
Here you can see the Comparison between the old 2004 version and new 2022 Half-Life 2 main menus user interface.
This is yet to be released to the stable branch, however you can access it by switching Half-Life 2 to the beta branch and setting the launch option to “-gamepadui”. Enjoy!
You can access the new UI by switching Half-Life 2 to the beta branch and setting the launch option to “-gamepadui”