Total calculation in report not working from query

Version: 6.2.5.2
Ubuntu 19.04

Attempting to gain the total of a column in Base report, but LO hangs when selecting ‘Function.’ This occurs after having selected ‘Data Field Type as Function’ Selecting the Data Field.

The hang occurs when attempting to select ‘Function.’

Is the hang occurring possibly for trying to total a calculated field from the Query?

Not sure where to go or what to do at this point. Happy to provide example should this potentially be a ‘local’ issue.

Thank you