In Lawcus, we can customize the invoice templates. You can disable the hourly rates under the invoice template. Disabling the hourly rate field won't reflect it on the generated invoice.
Steps to disable the "Hourly Rate" column on the invoice:
Navigate to the 'User Avtar Icon' and tap 'Settings.'
Choose 'Bill Settings.'
Select 'Invoice Templates.'
Edit an existing template or add a new one ('pencil icon' for editing).
Click on 'Time Entries' and disable the 'Hourly Rates' column.
'Save' your changes."