Touchscreen control has been discontinued.
Touch screen button size
Our default touch screen buttons, for previous or next, are 100x50 pixels and will look something like:
If you are viewing this help page at 100% zoom, then this size is big enough that if you put your finger on it on a touch screen, then it you should be able to touch that area easily. A minimum button size of 50x50 pixels would be ideal. This one is wider that 50 pixels because we wanted room for the text of PREV to be displayed.