To expand a bit on Ronald's answer, the command set vlan egress 7 ge.1.2 untagged added VLAN 7 untagged to the egress list, without changing the VLAN 1 settings. You can check this with the show port egress command.
To configure an access port, you usually want to have both the port VLAN ID (PVID), used for untagged frames entering the port, set to the access VLAN, and the VLAN egress list for the port set to include just the access VLAN (untagged). You can verify the PVID using the show port vlan command.
The show vlan portinfo command is a good way to see the VLAN configuration on EOS.