Click on the "Edit All" button when the graph pops up. You can change just about anything here, but you cannot program most of the changes. So this is useful for changing final copies of graphs. There's really no practical way for the EpiData team to provide command line options for everything that can be done. Maybe over time, we can get users to suggest the most common options graphs should have - but wait until there is a way to manage the suggestions!
So to get percents, click on these tabs: Series, Marks, Style and choose Percents from the drop down. Make sure the box is checked for "visible". Even though this graphing widget doesn't have documentation, it is really simple to explore what you can do.
Jamie
When is write bar v1/edit
The edit window appears but Am not sure where to get the option to making the appearance.