In 3.4.1 and earlier, you could go into the right-hand menu, and go to any section (for this example we'll use "Experimental") and click the gear. The Preferences/Settings menu would open with the selected category (in this case "Experimental") set, and expanded. One could then add/change/delete the menu options under that category.
In 3.5.0, the gear opens Preferences/Settings, but leaves the list homed at the top of the list "Quality"
(System tested under Windows 7 64-bit, Exisiting 3.4.1 install, Cura 3.5.0 install without removing 3.4.1, will repeat with Windows 10 when I fire Win10 up.)