Beliefs are PART of a worldview, but beliefs don't constitute worldviews themselves. It's no different to saying houses are made from bricks, but a brick is not a house.
Some beliefs may encapsulate a worldview. An example might be: I believe that Love is all there is (to reality). Due to plurality, I agree that in many instances that an individual is more likely to have a set of beliefs that make up their worldview. But belief alone may not be what constitutes one's worldview. Then again, it may.
I don't "choose" either, because I believe that your above statement is inaccurate and displays a basic misunderstanding of the definition of the words "belief" and "worldview", at least as far I have been defining them in this thread.
I have read your definitions and shown how your Bayesian link states that some beliefs are voluntary. If you wish for a particular definition to be made front and center, I'm most willing to work with it. I get that you have defined beliefs as "proposition which is held to be true." Some propositions are clearly chosen. You are choosing to hold true that a previous statement I made displays a basic misunderstanding (for you). And through the magic of projection, holding the proposition to be true about me / my understandings. You could choose otherwise, and it wouldn't need anything from me (going forward) to update that proposition.