A good workaround, but making the keyboard smaller isn’t a long-term solution. Cool trick, though. Thanks for sharing. I just tried it, and it’s pretty neat.
Split the keyboard
When Split Keyboard is turned on in Settings, tap in a text field to open the onscreen keyboard, then do any of the following:
Split the keyboard: Touch and hold the Hide Keyboard key, slide your finger to Split, then release.
Put the split keyboard back together: Touch and hold the Hide Keyboard key, slide your finger to Merge, then release.