Original sentence: Flip the pages like a book or spread them out flat.
Correct and clearer version: Flip the pages like a book, or lay them out flat.
Why this is good:
- The original sentence is okay, but adding a comma before or makes it easier to read.
- We use lay them out flat to mean put the pages on the table so you can see them all.
- Flip the pages means turn them one by one, like when you read a book.
Short, easy sentence you can use: Turn the pages like a book, or put them flat on the table.