If there are issues with the keyboard not appearing on the Lenovo tablets, please follow the steps below:
Tap the "Settings" Icon on Menufy Home Page on the Tablet.
Tap "Advanced" in the top right corner then "System" in the top right corner.
Go to "System" at the bottom of the page.
Tap "Language & Input"
Tap "Virtual Keyboard" under "Keyboard & Inputs"
Tap "Manage Keyboards"
Turn off "Google Voice Typing" (toggle switch to the left) so the option is grayed out. After this the "GBoard" should be the only active option left (switch is toggled to the right like the screenshot below).