Starting with the release of Strategy ONE (March 2024), dossiers are also known as dashboards.
STEPS TO REPRODUCE
1. Create a Blank Dossier.
2. Create a graph visualization.
3. Add metrics and attributes – for example Cost and Category in the Tutorial project.
4. Enable axis labels option for the graph.
5. Make sure the number format of the metric is set to Currency.
6. Open the Dossier in the Library application.
In Library Web:

In Library Mobile:

ACTION
This behavior is currently under investigation, please contact Strategy Technical Support for an update on the status of this issue.