Hi Michele,
Thank for contacting us and reporting this issue to us!
I have tested the mentioned demo and the issue is present only in Safari.
We have made a work item for this and we will work on to fixing it.
Please, do not hesitate to contact us if you have any additional questions.
Best regards,
Yavor Dashev
Smart UI Team https://www.htmlelements.com/
We investigated the item, but we are still unable to find a solution for it. It is related to the smart-tabs component with specific sizes in auto-hide mode only. Once the issue is resolved, the information will be published in the release notes section on our website.