Using latest update on Windows. I found the tool per your instructions, but do not wind up with any text visible. I'm in the 2D view top layer same as adding traces. Document/Test - box shows where you can type the text and specify size and position OK. But when I press the button to add and place, I see for maybe 1 second my text in red in the gray area adjacent to the board. They it disappears. The Cursor is in + mode, no text attached to it as I'd expect so that I could drag it to where it is needed.
When I try to add dimensions sometimes that works in red but not always as I would expect. Example, a rectangular PCB with radius at the corners. I wanted to show overall dimension of the flat to flat just past the corner's arc. I used the vertical choice tool, but what I get is the radius measurement.