Do you have an SD card installed? If you do have an SD card installed, did you opt for portable storage or internal storage after installing the SD card? The latter is used to increase the overall size of internal storage and mounts the storage area permanently making it impossible to view the contents of your phones' storage from your computer.
Swipe down from the top of the screen. You should see USB options. Tap this and see if it presents you with other options. If MTP is available, select that and see if your phone is now recognized by your laptop.