Tethering Nikon D750 and Lightroom

I just purchased a tethering cable for my Nikon D750 and MacBook Pro.  The cable fits fine.   LR (using version 7.2) recognizes the camera but I came across a few issues that I can't seem to fix:

1.  I can't see the image that I am trying to compose on the computer.  I have to look through the camera's view finder to compose the image, then I shoot it using the button on my laptop.  The image, once taken, appears on my laptop...but I would like to be able to see the image on my laptop WHILE composing.  Is there something I need to adjust in LR or on my camera to do this?

2.  Does the image save to my laptop AND the memory card?  When taking some test shots, I noticed that the images were being saved to my laptop but when I looked at the file review on my camera, it said that there were no images and that the card was empty.  Later, I put the memory card into my desktop computer, and the images were in fact there.  So I guess they did save to my memory card?  Does this happen once the tether session ends?

If you know the answers to either question, I would be grateful for any advice.  Thank you!