Each of the iPhone camera lenses has a minimum focus distance that you have to be mindful of. If you get too close beyond the minimum focus distance, the other cameras are going to take over and switch giving you the appearance of the other lens. The main 1X camera has a minimum focus distance of 200mm which is 7.7 inches. If you have macro mode turned on and if you get closer than 7.7 inches the ultra wide camera will take over and switch.
The 5X camera has a minimum focus distance of 53.15 inches or 4.43 feet. which means you can’t use the 5X Camera, any closer than 4.4 feet away from your subject. if you get closer than that, then the 1x Camera will copy the magnification of the 5X and zoom in and it will switch.
Third-party apps, like Halide, Moment, pro camera, etc. Will allow you to hard select the lenses to where they won’t switch. It’ll just have to get used to using a third-party app to take some of your photos which is a bad thing because you have way more control over your cameras with a different camera app.
You’re getting frustrated because you’re exceeding the minimum focus distance for those camera lenses. Take a look at the date below for the main 1X and 5X Camera.
If you don’t have the max iPhone, then the 3x camera has a minimum focus distance of 25 inches or 2.1 feet
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