How to cancel / stop job from the queue... it tries to move 5k emails and takes 5 sec for each

I just set up a rule and processed it over 30k emails and now it’s trying to move about 5k emails to the new folder based on the rule. It takes a super slow 5 sec per email to move and can’t use it the client for sending emails at all

Please help. How can I cancel that job? it will take forever to move all emails. I think it’s also a big bug, how can it take so much time to move a single email to a folder?