A "pulldown menu" is a list of options that you can choose from. When you click or tap on it, the list will appear below or drop down, giving you different choices to select. Full definition
The site will be easy to navigate, with pulldown menus and search fields. (realtormag.realtor.org)
OnePlus includes an OTG USB toggle in their notifications pulldown menu (in the extras, when you tap the pencil to edit the collection). (slashgear.com)
If that were true, there wouldn't be a «casual» option for the question about what kind of relationship you're looking for or dates in the 1990s on the pulldown menu for your birthday. (datingsitesreviews.com)