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MySQL error 3747

MySQL server error 3747 is ER_RUNNING_APPLIER_PREVENTS_SWITCH_GLOBAL_BINLOG_FORMAT, reported with SQLSTATE HY000.

Changing @@global.binlog_format or @@persist.binlog_format is disallowed when any replication channel applier thread is running. You could execute STOP REPLICA SQL_THREAD and try again.
Error3747
NameER_RUNNING_APPLIER_PREVENTS_SWITCH_GLOBAL_BINLOG_FORMAT
SQLSTATEHY000
GroupServer errors

Source: MySQL 8.4 Error Reference