That's the traditional Mac way. e.g. historically you would "pull down" on the menu bar at the top of the screen. You would click and hold, and slide the mouse

That's the traditional Mac way. e.g. historically you would "pull down" on the menu bar at the top of the screen. You would click and hold, and slide the mouse down, releasing the button to choose an item. If you were to just click on a menu, it would quickly open and close again. I want to say it's typical for Linux desktop environments to open contest menus on mouse down, as well, but don't recall offhand. Blender dates back to 1994, when many modern conventions weren't really a thing yet (Windows 95 didn't even exist)...and they have put a lot of time into modernizations in recent years. Back when I was dabbling in Blender, in the early 2000s, Ctrl+S was the keyboard shortcut for "erase everything and create a new scene."