I just downloaded the asus battery health charging app on microsoft store. The charging options are there not greyd ou, but when I plugged in it's still charging to 100%. Any idea on how to fix it?
Had the same problem, then I read a post on Reddit that claimed you needed to install something called the "ATK" package as well. This controls hotkey function, and apparently some part of the "Battery health charging" app. I downloaded the ATK pack from the ASUS website, and it did indeed unlock the choices (i.e. make them not greyed out anymore).
Enter your laptop model in the page linked here and you should be able to find the ATK package you need: https://www.asus.com/support/Download-Center/