Hi @nyeager,
It's true that we cannot change views of a document library and additional file properties except file name in the SharePoint app on the Android or iOS device. This behavior is by design.
However, we found a workaround for you. You can click Site Content, it will redirect to a website page window (like in the browser.). In there, click document library which you want to change the view.
Personally, I completely agree with you, this is indeed a good addition to the current features of SharePoint. Thank you for bringing things to our attention. We sincerely recommend you go to SharePoint Feedback community to provide your feedback: SharePoint · Community (microsoft.com). This is the best platform to let related team hear from you and make the products and services better for you and others.
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