I understood what the problem is. And although I understand, I'll still write how I did it, and suddenly someone will face this problem.
I installed the switch through the Easy Smart program, and this was my problem, because the "Not Member" section is missing, but it is there if you configure the switch through the web interface.
As soon as I added all the ports to another vlan, I was able to remove the necessary ports from 1 vlan.
Do not judge strictly, it was my first experience in setting up smart switches.

Thank you for attention.

Hello, I also found the setup screens for the VLAN a bit quirky. As you said, cannot remove ports from VLAN 1 until a another VLAN is set up. I've been running a 802.1q network with the SG108E switches for about six months and very happy with the results.

Cheers!

The East Smart Configuration utility has not been updated to allow removing VLAN 1 from ports. I suspect the reason is that the ability to remove VLAN 1 has not yet been implemented in the firmware for other switches in the family. I know this is true for the TL-SG1024DE.

@Buba @tplink 

 

On a TL-SG108E V2, I (still) cannot remove VLAN1 from a specific port.

 

I'd like port 7 to be VLAN 107 as an access port/untagged vlan (only).

The web interface doesn't allow entering VLAN1

 

 

 

 

(Also tried the latest Configuration Utility, but on applying, settings aren't saved either)