Context
My dad has a new phone since we recently switched back to Total Wireless from Sprint. It is another Android phone so most things are the same but there is one feature missing. He cannot drag and drop appointments on his Google calendar to different days or times.
Search terms
Google calendar app drag items
Helpful link
https://support.google.com/calendar/thread/850605?hl=en
Outcome
It turns out that disabling an accessibility feature called “Select to speak” resolved this issue.