Having to do this from memory as I don't have access to Zephyr Scale at the moment 😞
I'm guessing you want to share with external people. I don't think there is a PDF option at the moment but some options that might help:
1. You can run a report with your criteria and share the URL. The criteria is dynamic and included in the URL so when run, the report will be updated
2. You can download the dataset used in the reports, e.g. execution test results (list), and create your own report suite
3. You could try a 'print to PDF' on the dashboards but not sure how that will look
