Some, but not all, manufacturer apps for smartphone cameras offer manual setting options. To this day, Google has even completely refrained from doing this and leaves almost everything to the integrated automatics. So interested users have to resort to alternative applications, some of which are available in the Google Play Store. This includes the “Manual Camera: DSLR Camera Professional”.
Settings like those of a professional: get more out of your own smartphone camera
We usually pay 4 euros for this. But currently you get the app completely free of charge. It allows you to manually adjust exposure, focus, white balance and other factors. If you are familiar with it and want to get more out of your smartphone camera manually, you can try this with this app. In any case, an average rating of 4.3 is decent and definitely speaks for a try.