I saw on my english book the exercise’s sentence:
According to many, Google is changing our lives by broadening our knowledge of the world.
Is it also correct “changes” instead of “is changing” in this sentence?
I think so because present simple is about permanent situations.
Yes, both are correct. “Is changing” puts more emphasis on the current moment: the change that is happening right now. But you could also write “Google changes our lives”, and the meaning would be almost the same.