Is there any way to reduce the height of the window in the TAKE PHOTO widget?

I love this widget (TAKE PHOTO).  But, the camera window is so tall that cell phone users always have to scroll down to snap the photo.

I can see that you are using the Cards layout in your form. Unfortunately, it is not possible to add custom CSS to forms using the Cards Layout.

If you change the form layout to Classic, you can change the height of the widgets by adding this CSS to the form.

iframe {
  height: 100px !important;
}

Help Article: How-to-Inject-Custom-CSS-Codes
Help Article: How-to-Change-the-Form-Layout

You can also try removing the title and the description in the question to make room for the widget and show the instructions on the previous page.