In 9.10, the button to add adaptive image breakpoint sets does not function. Use the workaround in the solution until a fix is released.
- Enter http://<yourHostName>/workarea/mobilesettings/addeditbreakpoint.aspx in your browser.
- Add breakpoints and click Save .
- Return to the adaptive image settings section of the workarea (making sure that you refresh).
- Check off the new breakpoints to enable them.
- Modify the height and width of the breakpoint and click Save .