Blocking with multiple blockers

Hi,
I'm probably missing something, but is it normal that when blocking an AI creature with multiple blockers I get to decide who of the blockers gets damaged? Even more so, I can assign damage however I please, I don't even need to assign lethal damage to any of them, I can just spread it all around.
Note that I'm very new at Magic, I'm still learning, but all the searches I did say that it's the attacker who assigns damage and does so in an order that he chooses and can't spread the damage.
Thank you.
Edit: I'm using 1.5.7
I'm probably missing something, but is it normal that when blocking an AI creature with multiple blockers I get to decide who of the blockers gets damaged? Even more so, I can assign damage however I please, I don't even need to assign lethal damage to any of them, I can just spread it all around.
Note that I'm very new at Magic, I'm still learning, but all the searches I did say that it's the attacker who assigns damage and does so in an order that he chooses and can't spread the damage.
Thank you.
Edit: I'm using 1.5.7