Solution (work-around)
- This solution works, even though it is a work-around. Be sure to not have other windows of Grafana open when trying to save the panel and dashboard, otherwise the changes might not persist.
- Select panel title → Inspect → Panel JSON
- Set “type” to “table-old”
- Apply
- The visualization should now appear as Table (old) and in the right side will appear Column Styles
- Column Styles → Options → Name pattern set the name of the column to hide
- Type → Hidden
Many thanks to @codlord for mentioning the “table-old” solution