I had the same problem when I first got my S5, it was in easy mode by default.
I wanted to keep my phone in easy mode and get the cog wheel on the camera at the same time, to do that you go to settings >> easy mode >> untick camera then click done, now the settings cog wheel shows on the camera, whilst keeping the phone in easy mode.
Just posting for reference in case anyone doesn't want to use standard mode, and feel they need to use it to get the cog showing.