The touch keyboard was function correctly on my new Lenovo Yoga 13 in both laptop mode and tablet mode.
After adding second language the touch keyboard works at both modes.
After close the LED screen then open the LED, touch keyboard works only in laptop mode. In tablet mode when touch a text box or call the touch keyboard from the desktop task bar directly, the keyboard will pop up then disappears.
After restart the PC, in both modes the touch keyboard pops up then disappers.