Hi Kevin,
I agree it would be nice if there were more customizations easily available. The only way I know to make that specific customization in JMP would be to show the properties panel (right click the outline box grey triangle next to graph builder > show properties), then select the frame box, then change the values for "Margin," which will control the spacing around the frame box (don't be distracted by border, that won't actually do it). The color here is picked up from the graph spacing color, which you can change by right clicking outside the frame > graph spacing color. Here's a screenshot and short demo of that. Note that these changes are *not* captured in the platform script.
