Quota Limits in systemctl

Question

I set Quota limit on nginx by running

systemctl set-property nginx.service CPUAccounting=1 MemoryAccounting=1 CPUQuota=45% MemoryLimit=8G

it works fine now I want to remove it I run

systemctl set-property nginx.service CPUAccounting=0 MemoryAccounting=0

this command disables the Quota but the files still exist in

ls /etc/systemd/system.control/nginx.service.d/

1. is there a way to remove quota completely from systemd (I want to remove nginx.service.d folder by command)

2. Can I list all Quota limits on all services ?