As I could not find it at once while searching Admin > Posting / Viewing / Lists / Permissions, I thought it would be good to let others know where it is:
Go to Admin > Spam >Automatically hide posts which reach: X flags
Welcome to the Q&A site for Question2Answer.
If you have a question about Q2A, please ask in English.
To report a bug, please create a new issue on Github or ask a question here with the bug tag.
If you just want to try Q2A, please use the demo site.