Why can't I leave the channel?

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Summary
channel
(This is auto generate channel when first setup.)

I’m system admin.

Other channels have a “leave channel” button, so why doesn’t this one have a button?

Steps to reproduce
Self-host 5.37

Expected behavior
Leave channel.

Hello, @Gogogo

Since you mentioned that this channel is the default channel that was created when you set up Mattermost for the first time:

This is auto generate channel when first setup

I would think that this channel behaves like the default Town Square channel:

image

which does not have the leave channel option since it is meant to be the single channel where every user in the Mattermost team can collaborate together.

If you are looking having the feature to leave the channel, we do not have any specific feature available to do so. This topic has been brought up to the team here:

Can I please quickly check if the name of the channel was defaulted to 11 when you first launch Mattermost as the system admin?