Which part of mux do you want to be added ?
All possible configuration are exist now.

Outbound‘s part:
{
"enabled": true,
"protocol": "smux",
"max_connections": 4,
"min_streams": 4,
"max_streams": 0,
"padding": false,
"brutal": {}
}

Now the outbound multiplex only has:

"multiplex": {
"enabled": true
},

Are you sure?

Apologies for not being clear initially. Let me clarify my request. The program generates a JSON subscription file with the "http://1.1.1.1:2096/sub/xxxxxxx?format=json" link. However, the generated JSON only includes "multiplex": { "enabled": true }. The issue seems to be related to the "client side" settings in the inbound section of the program. Specifically, the missing details related to multiplex, such as "protocol": "h2mux", "max_connections": 4".

Checking the frontend/src/layouts/modals/Inbound.vue file to add the necessary configuration may help this, I am not familiar with this, sorry. This way, the client should correctly use the generated JSON subscription link.

Okay, I will take a look.

I have removed automatic multiplex config for inbounds and add separated client side multiplex configuration in client side configuration.

Please build the codes or wait for new release.