I can’t find a global setting for disabling logos in a library. You should probably ask @drzoidberg33. He is the guy to go to for questions about logos and I think he’s done a brilliant job.
I was a little sceptical about logos at the beginning but I must admit, I’m beginning to like them. The secret here is to get the right logo with the right background art or square image.
You can see some examples here.
And I have many more that I think look great.