Apple Books showing only Library and Search

I bought an Iphone 11 in August last year and ever since the Apple Books app has showed me only library and search options. Lately I get to see from time to time other options, such as book store, reading now, etc. I didn’t even know that’s how to the app is actually supposed to look like. What should I do to get all the app options to work all the time? Right now I’m having only library and search options available again.