Starting with the release of Strategy ONE (March 2024), dossiers are also known as dashboards.
SYMPTOM:
In Dossier Bullet Chart visualization, the info window is truncated when only one attribute element is shown in the chart:

STEPS TO REPRODUCE:
1. install the Bullet Chart visualization from https://community.strategy.com/article/Bullet-Chart
2. import the BulletChartDemo.mstr into the reproduction environment
3. add a filter on one of the regions
4. hover over the Bullet Chart
CAUSE:
This is an identified defect in Strategy Web 10.9.
ACTION:
Currently this issue is being reviewed by Strategy for a potential code fix on an upcoming Strategy release.