I was having the same problem with my Inspiron 7506. Here's how I fixed it:
Hit the window key and search for "Intel Graphics Command Center" - you should see a message on the left side of the screen titled "New dGPU Detected!" Follow the instructions there - but I'll paste them here as well.
"1. From Start Icon, type "Graphics Settings". Click on the results from System Settings.
2. Click on "Desktop app".
3. Click on your application. If your application is not on the list, you will need to browse to the folder where the .exe file is located. You may need to look up the folder location of this file using a search engine.
4. Once identified, click "Options".
5. Set the application to your preferred GPU.
6. Hit save."
As a note, if you're struggling to find Photoshop for step 3 (it didn't show up for me, since it's looking for games), use the windows key to open the start menu again, type "Photoshop" and right click on it - then click "Open file location". Now that you're in the file location, copy the file path in the address bar at the top (something like C:\ProgramData\Microsoft\Windows\Start Menu\Programs) and paste it into the address bar you open up when you click "Browse" in step 3 inside "Graphics Settings". For step 5 above, I selected "High Performance". Now photoshop can be detected! You might need to do this for any other programs that you want to detect the GPU - pretty annoying, but this is an easy workaround until this gets figured out.