Hide onscreen buttons of back, home & recent apps in Keyboard apps on Moto G5 Plus

I have Moto G5 Plus. I have enabled One-button navigation in Moto Actions using which I can use the swipe actions on home button to replicate back/home/recent apps buttons. This hides the onscreen buttons of back, home & recent apps. But when any keyboard app is open (SwiftKey, GBoard) then these buttons appear onscreen. How can I hide these buttons when keyboard app is open?