How to Enable Sales Invoice?
Navigation
Go to Home > Settings > Invoice Settings > Edit.

Enable Sales Invoice
Click on the dropdown next to Enable Sales Invoice and select Yes.

Enable Auto-Numbering
After enabling, then next to Enable Auto-Numbering, select Yes.

Fill Required Fields
After enabling, fill in the required fields such as Prefix, Median, Suffix, separator, and other related options.

Save Changes
Once you've completed the configuration, click Save to confirm the changes.
