Blacklist is the type of ban that contains the names of those who are strictly prohibited from leaving or entering any state of UAE for committing a crime or an illegal act. You can check whether you are blacklisted or not by following some methods.
It’s not possible to check blacklisted status online through the eDNRD portal. You may need to make an inquiry with them by contacting them directly. You can go to any headquarter of the criminal investigation department and request for the same using your Residence visa page or Emirates ID or you can get a representative to go and check on behalf of you.
The quickest course of action should be asking a friend in the UAE to visit a police station with a copy of your passport, and ideally a letter of authority, to inquire if there are any cases or complaints registered. They will not be told details, just if there are any cases on file. Or you can hire a registered lawyer to check your current ban status instead of going by yourself.