Hi Akin,
Not sure if I understood correctly, but let's say you have the following:
LACP 1 - Ports 1, 5
LACP 2 - Ports 2, 6
LACP 3 - Ports 3, 4
And you have ports 1, 2 and 3 added to vlan "default".
If you do "configure vlan default delete ports 1,2,3", then all 6 ports will be removed from vlan "default". Also if those ports are used as uplinks to reach this switch, you will "isolate" the switch.
When you add/remove a LAG master port to/from a vlan, that action will happen to all ports in the LAG.