A list of widgets that can be added to a dashboard from editing panel on dashboards is understood as a list of buttons by a screen reader instead of menu items.
Steps to Reproduce
1. Navigate to Performance Analytics > Dashboards.
2. Open any dashboard.
3. Click the '+' icon and to add widgets.
4. Select any category.
5. Inspect the markup on the list of elements.
This problem is under review and targeted to be fixed in a future release. To receive notifications when more information becomes available, subscribe to this Known Error article by clicking the Subscribe button at the top right of this form.
Related Problem: PRB1388400