Google’s keyboard, (not so) cleverly called Gboard, has been updated with a new floating keyboard function. It’s a tad complex to access: Hit the G in the upper left corner (or the arrow, depending on how you have it set up), hit the three dots, and press on the floating keyboard button.
From there you can resize it and move it around, taking up the part of the display that you want it to. It will go transparent after a short period of time to be a bit more out of your way.
It’s a simple and nice to have feature but it’s just annoying to get to. Nonetheless people with larger phones may appreciate it. Head to the Play Store to update Gboard and give it a shot!