The Invoice Description is many times an optional field that can be used for your own purposes.
Many clients leave this blank, or use the same wording for all invoices (which you would do by not checking the checkbox and leaving it set to Fixed Value with nothing in it), otherwise use one of the options shown. Data can also be pulled from any of the fields shown.
Window Title and File Customizations
All fields here are optional and self explanatory as shown above.
Enable Billing Start and End Date Override
LEDES files all contain Billing Start and End Date fields. Medusa normally calculates this automatically using the earliest and most recent line item dates in your invoice. If you need to specify some other dates, either set it to automatically use the first and last date of the month that the invoice is in, or use the two date selection boxes (these will need to be adjusted each time for a given run of invoices).
Backup/Restore Configuration Settings
Backing up your configuration settings is not generally required very frequently but should be done periodically (i.e. after the initial setup, and after any significant changes to your settings), and will save a lot of time in the event of a system crash (or installing a second copy on another machine). Follow the instructions on the configuration screen to create a backup of your configuration file, and to restore your settings if necessary. If you do separate, normal backups, this also may be sufficient. All settings are saved in one file called config.pkl and can be also be restored manually by simply copying it to the installation folder.
Zero Dollar Line Items
Many providers don't allow a line items in LEDES files that have a zero dollar amount. Medusa will automatically strip these out by default unless this setting is changed. You may also simply turn off the warning that shows on the main Medusa screen when processing.