As root, open /etc/firewalld/firewalld.conf and edit the file as follows:

 # default zone
 # The default zone used if an empty zone string is used.
 # Default: public
 DefaultZone=home

Reload the firewall, by entering the following command as root:

~]# firewall-cmd --reload

This will reload the firewall without losing state information (TCP sessions will not be interrupted).