There's no way to make this change to all VLANs with one click. You can edit multiple VLANs on the same page, but if you have a large amount this can still be slow.   As you're making the exact same change on multiple VLANs in multiple networks, I suggest utilising the API. It would be far more efficient to iterate through them and update the configuration.   https://developer.cisco.com/meraki/api-latest/#!update-network-appliance-vlan ... View more