Hi edwardsmarkf,
I don’t recommend you in this case to modify the z-index of the component.
However if the use case requires it you can change for example like so:

smart-window{
    z-index:9999999;
}

Also you can share a code example of your scenario and then we could be able to give you a more suitable solution.
Please, do not hesitate to contact us if you have any additional questions.
Best regards,
Yavor Dashev
Smart UI Team
https://www.htmlelements.com/