why does mynew mac say no available window

Hello Constance,

Thank you for using Apple Support Communities.

We understand that you are running into an issue where your new MacBook Air is returning a message "No Available Window". Take a look at this other Communities thread where another user resolved the same issue. They discovered that they were pressing too hard on the trackpad and lightening their touch resolved the issue.

No Available Windows Problem & Solution

Let us know if this doesn't work for you and we can go from there.

Best regards.