Single lens iPhones (SE & XR) can only take Portrait-effect photos of humans, not animals or objects, unlike the phones with two or three cameras.
But an app called Halide Camera overcomes these issues as well as making RAW images possible. Absolutely awesome app, often paired with another called Spectre Camera. In fact, the two are available as a package for less cost than the same two bought separately.
Spectre brings long exposure capability to the iPhone, various modes including the ability to remove crowds.