VLAN List is unavailable in Spectrum OneClick under the spotlight menu in Topology View.
VLAN Configuration has not been enabled.
1. Log into OneClick as an ADMIN user
2. Find and select the VNM model
3. Click on the Information tab in the Component Detail section
4. Find and expand the SpectroSERVER Control subview
5. Set the VLAN Configuration parameter to Enabled
Please take note this will initiate VLAN discoveries which can cause performance issues with the SpectroSERVER if VLAN configuration changes often.