How to switch Quiescing to Normal Mode in Oracle?
You are mixing up quiescing a replication master group and quiescing a database — these are different concepts:

ALTER SYSTEM QUIESCE

Use the QUIESCE RESTRICTED and UNQUIESCE clauses to put the database in and take it out of the quiesced state. This state enables database administrators to perform administrative operations that cannot be safely performed in the presence of concurrent transactions, queries, or PL/SQL operations.


Master Group Quiesce

At times, you must stop all replication activity for a master group so that you can perform certain administrative tasks on the master group. For example, you must stop all replication activity for a master group to add a new master group object. Stopping all replication activity for a master group is called quiescing the group. When a master group is quiesced, users cannot issue DML statements on any of the objects in the master group. Also, all deferred transactions must be propagated before you can quiesce a master group. Users can continue to query the tables in a quiesced master group.



After quiescing a replication master group, RESUME_MASTER_ACTIVITY resumes normal replication activity.