I thought Tsar Bomba was designed to have 100Mt yield, but they dialed it back (by using less fissile material I think) because there was no reason to set on of

I thought Tsar Bomba was designed to have 100Mt yield, but they dialed it back (by using less fissile material I think) because there was no reason to set on of that large and because of safetey. It was my understanding that the nearby towns wouldn't be threatened by a 50Mt bomb and but a 100Mt was expected to break windows and stuff. Also the time for the pilots to get away was improved.