Where do I find update notes on the recent UI changes?

I'm currently in Beta ring and I noticed there was an update (current tab underlining in the guide, different Game Pass logo when I start the games on GP, some extra text on Full library page of My games & apps), but when I looked for update notes (most recent Delta & Beta update) there was basically nothing on the things I noticed (in fact there was barely anything by the way).

So my question is, where do I find update notes on these changes? Is it a public build update? Where should I look?

submitted by /u/argivalor
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