Starting with the release of Strategy ONE (March 2024), dossiers are also known as dashboards.
SYMPTOM:
In VI Dashboard, creating a bar graph with 2 or more metrics, there was a "Metric Names" label created in visualization editor.
Right Mouse Click provided 2 options as in following image:
"Top Column" & "Bottom Axis"

CAUSE:
Those options were disabled in Dossier.
WORKAROUND:
1. When metric names is put in bottom axis: drag and drop the metric names to "Break By" drop zone.
2. When metric names is put in Top Column: drag and drop the metric names to the Horizontal drop zone (assume attribute is in Horizontal and metrics are in Vertical).