I haven’t seen this concept discussed on here, so here’s an introduction.
In the 20th century, academic writers were trying to describe how ancient polytheist religions worked. Apparently they didn’t look at how contemporary polytheist religions work- especially those that avoided imperial takeover and widespread missionary work. They invented terms like monolatry, henotheism, kathenotheism, summodeism, soft and hard polytheism, etc. They didn’t notice that for an individual it’s often not a static thing.
They also didn’t think about Catholic veneration of saints. Some people focus entirely on one saint. Francis, Christopher, the Virgin Mary etc. Some ask different saints to intercede for different things- Christopher for travel or selling a house, Lucy for eye troubles. They may honor different saints on their feast days, and they may honor the patron saint of their work. Things can shift daily depending on what’s going on. Those aren't thought of as different types of religion, it's just how many Catholics operate.
I think Dr. Edward Butler was the first person to talk about polycentric religion in a polytheist context. A devotee’s ‘center’ can shift, or not, the focus can widen or narrow, and other deities may move into the periphery.
One of the least-technical articles on this is: Polycentric Polytheism