@Andrew_Cooper1 , good question!
The donut graphs always display from highest to lowest which is not always useful, especially when you want your values to display consistently, say a 1-5 star rating for example. And no, you cannot currently reverse this order (at the time of writing).
But with ‘Column’ style charts, they will display the bars in the order of your custom field’s options. This may be a good thing because you can completely control the order of how your bars will be displayed by simply editing the sorting of your dropdown values. On the down side, you may not want this if your dropdown is displayed in a form for example, or you want a different sorting in your List view for example.
Note, at the time of writing you can currently display up to 12 bars along the X axis of a ‘Column’ style chart, i.e. your top 12 custom field options will only be displayed.
Also note for numeric values you can also use negative numbers which will also display as expected in a ‘column’ style chart, with the bars below the line, instead of above 