@Pixpix
It's my problem, I didn't make myself clear.
In fact, VLAN and VLAN Interface are not the same. If you set up a VLAN, there is no way to communicate between different VLANs.
But the VLAN Interface is different. After setting it up, they can communicate with each other.
If you want to do isolation or other operations, you can use ACLs.
There is an article on this subject which you can refer to:https://www.tp-link.com/en/support/faq/3091/