If you use a Magic Keyboard, Smart Keyboard, or any Bluetooth keyboard with your iPad, you have probably noticed the on-screen keyboard switcher just is not there. This is expected iPadOS behaviour, and there is a simple way around it.
iPadOS hides the on-screen keyboard switcher whenever an external keyboard is connected, because it assumes you no longer need one. To get it back and switch to WordBoard, tap the keyboard toggle button at the bottom of the screen, choose Show Keyboard, then use the switcher (the globe key) as you normally would. You do not need to unplug or disconnect your external keyboard.
On iPhone, the globe key that switches between installed keyboards is always available in a text field. On iPad, iPadOS treats a connected external keyboard as your primary input method and suppresses the on-screen keyboard, including the switcher, on the assumption that you are typing on hardware keys instead.
That is fine if you only ever use the built-in keyboard. It becomes a problem the moment you want to switch to a third-party keyboard like WordBoard, because the control you would normally tap simply is not on screen.
Once WordBoard is active, you can keep typing on your external keyboard for regular text and still tap WordBoard keys on screen for saved snippets, templates, and quick replies. The two are not mutually exclusive.
If you have not added WordBoard as a keyboard yet, do that first in Settings, General, Keyboard, Keyboards, Add New Keyboard. See the full guide to switching keyboards on iPhone for the setup steps; they are identical on iPad.
If you split your typing between an iPhone and an iPad with an external keyboard, your saved keys do not need to be rebuilt on each device. See using WordBoard on both iPhone and iPad for how one Pro purchase and sync cover both.