When we ask our professor for the recommendation letter, are we allowed to see/read it? Or does it have to be confidential like most other rec letters

I've asked for many recommendation letters in the past from professors for programs like the Peace Corps or Fulbright, but this is the first time where I'm asking them but will be able to see it. Is this okay to read it? Because we have to right? when putting all our required documents into one pdf to submit. Does this change how they write them?