How do I remove the empty values column from a report in Insights?
Unfortunately, it's not possible to delete the values column. This appears when you select just the attributes in your report and don't include any metric. This is not the recommended way; the platform is designed to calculate the reports by returning the metric values sliced by the attributes present in the report. This is why the values column is always there - the metric is expected to appear in the report.
The metric also serves the purpose of tying the attributes' values together, and without any metrics the system would try to connect the attributes in every way possible, which can easily throw the report out of the limits.