searching I found this:
A bit of an old topic, but in case anyone abandoned Kivy because of this issue
(like I did), I found that it’s been fixed!
Mouse cursor support was added by way of the TouchRing module, which is a
default addon module that allows you to see a ring around your touches (this
lets you calibrate your touchscreen if needed, for example). You simply need to
enable this module and pass it a command to enable the mouse cursor.
Once you’ve compiled and installed Kivy, you will have a hidden directory in
your home directory named .kivy which contains config.ini. At the bottom of this
file is the [modules] section. In this section, add the line:
touchring = show_cursor=true
Now any Kivy app you run will have a working, visible mouse cursor! You can
ignore the old complaints about the keyboard not working too, since it works
just fine as well. I’m working on a smart thermostat project that will make use
of the upcoming Pi Foundation touchscreen, and now I can comfortably develop the
UI while I wait for the screen to come out.