How can I get my iPad Pro out of the dark mode?

Swipe down from the top right corner to get to control center, then tap and hold the light effect button, it will give you two options, dark mode, and Night Shift. If your iPad is an iPad Pro, or an iPad Air, it will give you a third option: true tone. Just tap the dark mode button. That will turn off dark mode. After that is done, just tap your screen anywhere outside of the control center icons, until you are back at your previous screen.