GarageBand on iOS 10 / 11: splitting drum kits for mixing/effecting - YouTube
The 10 Best GarageBand Sound Packs for iPhone and iPad
I'm a beginner, I only ever get the screen displayed in the upper part of this pic when looking at drum kits, but I want it to look like the lower part
GarageBand brings new Sound Library and classic Beat Sequencer - Apple
GarageBand Gets Over 480 New Loops and 18 New Drum Kits - iClarified
Play the Drums in GarageBand for iPad - Apple Support