E-billing can be enabled & configured for a matter in Matter Billing Options. System-wide settings are located at Admin > Billing.
The following formats are supported:
LEDES 1998B (98B)
LEDES 2000 (2K)
LEDES XML 2.0
LEDES XML 2.1
https://actionstep.zendesk.com/hc/en-us/articles/360011598474-E-Billing-LEDES-Billing in Actionstep Help Center