On the App Inventor to-do list there is an issue to investigate how to make the flydown field interaction sane for touch devices as well as mouse devices. The current gesture is to hover with the mouse to open the flydown, but hover isn't really an option on touch devices. We considered making it so that one tap would open the flydown and two taps would open the editor to change the variable name but that work was never completed since it would have needed to be updated anyway for the newer gesture functionality in Blockly. We should implement a reasonable solution for touch devices to make this work well in our "single device" mode.
On the App Inventor to-do list there is an issue to investigate how to make the flydown field interaction sane for touch devices as well as mouse devices. The current gesture is to hover with the mouse to open the flydown, but hover isn't really an option on touch devices. We considered making it so that one tap would open the flydown and two taps would open the editor to change the variable name but that work was never completed since it would have needed to be updated anyway for the newer gesture functionality in Blockly. We should implement a reasonable solution for touch devices to make this work well in our "single device" mode.