Let me see if I get this. If there was 100 new cases every day, you would want a graph that shows 0 everyday. Until one day there were 110 new cases, and that day you would want to see 10?Oh no shit. Good on you!
One graph I was hoping to find was the number of new cases per day over the previous day. Maybe since you have all the data entered it might be an easy formula for you?
Example: Monday there were 375 cases. Thursday there were 500 cases. So new cases over previous day is 125.
If you just mean new cases per day, the first graph in each category labeled Daily Testing is the new tests performed each day and the new cases each day.