Starting with Windows 10 build 17035, Microsoft is introducing the ability to see text suggestions while typing on a hardware keyboard. You can see three text suggestions near caret while typing and choose candidates in text suggestions if you find a word you want to insert. Set focus to the first suggestion by tapping the up arrow key on your keyboard and using the left/right arrow keys to change focus. To select the desired candidate, tap space or enter.
This tutorial will show you how to turn on or off show text suggestions as you type on a hardware keyboard for your account in Windows 10.