Multi-value report parameters do not display properly with Report Builder

When using multi-value report parameters, the dropdown does not appear in the proper position.

Repro steps:

1. Create a new report using Power BI Report Builder
2. Add a multi-value report parameter and specify some available values
3. Upload the report to app.powerbi.com
4. Share the report with an account outside your organization
5. View the report using that account and Microsoft Edge
6. Open up the dropdown for the report parameter

Results:

The dropdown appears on the far left edge of the window

Note:

The report appears fine for the report owner because it displays within the work space.  That is, there is a left hand menu and the report is contained within a central window.  Users viewing just the report will encounter this issue.