What is the difference between a study layout and a reading layout? How do I change from one to the other?
There is nothing in a layout that indicates how you are going to use it. A reading layout is one you intend to use for reading through a resource - the resource, notes, and maybe some dictionaries/atlases are relevant to the layout. A study layout is one you intend to use for studying. It contains whatever you are studying, the tools you intend to use, and relevance resources you expect to use.
Logos has training videos available and This One is on using Layouts.
You can find other videos here... https://support.logos.com/hc/en-us/categories/360000675231-Logos-Training