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Have you used the thumb-board (T-Board) yet? It’s tricky. The idea is that you use the pressure of your thumb or finger, say, in the chat screen and the T-board will pop up. You put in your line of text, then return to the chat screen.
You control the pressure to activate it in the Text Input Settings Control Panel:
You have to mash the screen pretty hard, with the default settings, but it works. Now it makes more sense…