Variant Drop Down with Craft Theme

[QuarryLifeLLC]

Good Evening,
I have the Craft Theme, and I was working with an add on app, and they said there were other themes that allowed for a drop down menu vs the mess I have currently in the Craft theme.

Anyone know which theme or if anyone has the HTML and where to add it in the Craft theme, I'm happy to play around and try not to break it.
Thank you!