If you’re in ‘VLANs’ mode (rather than’Single VLAN’) then you should be able to do it through the Addressing & VLANs page by editing the port. In single VLAN mode I don’t believe it’s possible - one of those oddities.
Welcome to the Meraki Community! To start contributing, simply sign in with your Cisco account. If you don't yet have a Cisco account, you can sign up.