Two puppies

Good morning! I got a puppy two months ago, His name is Bam, he is 16 weeks old. I got another puppy over the weekend, Koda, he is 9 weeks old. I know we aren’t suppose to change our schedule and keep everything consistent. I have a question. When we leave for work in the morning, we obviously crate them, should we let them be able to see each other or should we put the crate cover so they can’t see each other? I figured it would be better if they couldn’t see each other so they don’t get so frustrated. I can’t find an exact answer on google. Please and thank you.