MIUI Tip: Put several apps into a folder at the same time

First, launch the home screen editing mode. Tap on move apps, then tap on all the apps that you want to move, and they’ll be added to the dock. Tap on the folder widge to add it to the home screen.

Swipe from left to right, or from right to left to put the apps together. Then drag them (also together) into the newly created folder

 

Success!