Does anyone know if it is possible to change the order of the bars (Using a Bar Chart Type) in a Custom chart? It defaults to alphabetical, but would prefer it use the order of the field values.
Will you be able to include a screen shot showing one of the charts you're asking about?
Are you asking about any specific App (from App Catalog) or about charts in general? If in general, which one for example?
This is unlikely to be possible, unless the source code is available for the chart/report that you are referring to. Were the code be available, one could customize it as needed however generally speaking the order of the the bars along the axes are not able to be altered or re-ordered.