The Samsung Galaxy J7 Max does have a 'Pro' mode for its rear camera. What I didn't like is that it's quite limited, because you can only change three camera settings: exposure value, ISO and white balance. Just in comparison, the Samsung Galaxy S8 features a Pro mode as well but it's more advanced. In the S8 you can change the White Balance, exposure, ISO, color tone, shutter speed and use manual focus to manually set up the focus, rather than rely on the autofocus system.
Of course having an option to manually adjust the camera settings, allow photographer to get more control over how the image is turned out at the end. The more direct control over the camera settings, the more control you have on the final image output. I personally prefer having a direct control over the shutter speed. Why? because it allows me to anticipate and know ahead the effect that this will have on the image. Let me explain what I mean.
If I am near a river and I want the water stream to appear smooth. I know that I need to lower the shutter speed. I want to have a control over the exact shutter speed number, to I can fine tune it for best results. I can't do it with the Samsung Galaxy J7 Max rear camera. same goes to manual focus and other camera settings that I would have liked to have direct control over.
The Galaxy J7 Max obviously wasn't designed for advanced photography like some of the higher-end smartphones out there. It doesn't even have the option to shoot RAW, what you would have found in phone cameras that take themselves more.. well, let's say more seriously and want to appeal to enthusiast photographers. To be honest, I think that most of us have already became enthusiast photographers the moment we bought out first smartphone and understood how amazing it is having a camera with us everywhere we go. This is why I think that even phones in the J7 Max price segment should have more advanced camera features.
I don't know how hard it is just to give more manual controls and RAW option. After all, all photos taken with a smartphone camera process a RAW file in one way or another.
By the way, I am basing this info according to what's written in the Samsung Galaxy J7 Max manual for the SM-G615F/DS and SM-G615FU/DS phone models. There is no mention for RAW and in the camera section the manual only mentions three camera settings for the Pro Mode.
Just so you know, the exposure value determines how much light the camera's sensor receives. The ISO gives you control of the sensor's sensitivity to light, with higher ISO you get better low-light results but with more noise and the white balance assured true-to-life colors when shooting in various lighting conditions( e.g. under artificial light).
By the way, if you wondered how the J7 Max 'Pro mode' compared to the 'Professional mode" on the Moto G5 Plus. The Professional mode on the Moto G5 Plus gives you the same control as the J7 Max, but it also adds the option to choose the shutter speed like in the Galaxy S8.
Here is the Professional mode in the Moto G5 Plus.
As I said, it would have been nice to have more manual controls like shutter speed and manual focus adjustment.