I have updated this in mine, but would love another picker up top next to the workspace standard picker as we often have clients or recommend a separate audit workspace.

I can do a PR if you prefer, but I see you're working on 1.4.8 and may be able to toss it in :)

The workbook use to work but now comes up with this error:

union: column named 'TableName' already exists
Click to Retry.

Some parts of the workbook are still populating with data but 90% of the work book is broken. Same issue on both the Workspace Usage Report v1.3 and Workspace Usage Report v1.4

I'm having an issue with the map rendering correct results. Is this correct?

SecurityIncident
// Get the Workspace Name(s) from a parameter
| extend stringtoSplit = split("{WorkspaceIDguid}",",")
| mvexpand stringtoSplit
| where stringtoSplit has TenantId
| extend workSpacename = trim(@"[^\w]+",tostring(split(stringtoSplit,":").[1]))
// end of get workspace name section
| extend Tactics_ = tostring(parse_json(tostring(AdditionalData.tactics)))
| summarize count()
by workSpacename, Tactics_
| order by count_ desc