There's a new version of Wireshark out—a new major version that has many interesting features. Here, you can see the new Qt GUI:
It looks very similar to the Legacy GTK GUI, with few minor tweaks. The main menu bar here has had some icons changed and removed; the general interface is a little bit cleaner. All the general functionality, though, is all the same. Capture options are on the upper left-hand side and they are denoted by a gear icon. When you click on the gear icon, you have multiple tabs for Input options, Output options, and general Options:
When you click on Edit | Preferences..., you can see the preferences window, ...