To reset the charts back to the defaults that were installed with Bet Angel Professional, you need to do the following:
1) Close Bet Angel
2) Use Windows File Explorer to navigate to this folder: C:\Users\<YOUR_USERNAME>\AppData\Roaming\Bet Angel\Bet Angel Professional
3) Delete the files: advchart_imported.cfg & advcharts.cfg
4) Restart Bet Angel Professional and those files will be recreated from the installation defaults.