How can I view whether a public Slack channel is accessible (i.e., can be joined by) by the members of only the current workspace, just a few workspaces or all the workspaces of the organization in Slack Enterprise Grid?
Slack – How to view whether a Slack channel is only accessible by the members of a specific workspace or all the organization
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Related Solutions
You can restrict who can post to the #general channel on your team settings, in http://my.slack.com/admin/settings#permissions
Available restrictive options are Team Owners and Admins or Team Owners only.
You can rename #general to something more appropriate like "#announcements".
Currently, you cannot restrict posting rights to other public channels than #general.
More information is available on https://get.slack.help/hc/en-us/articles/220105027-The-general-channel
On the website you can use the Quick Switcher to switch between channels on workspaces
Otherwise you have to download the desktop app. In the sidebar where channels are listed it also shows another sidebar to the left of that which shows all the workspaces that you are part of:
In the screenshot above you can see that there are 6 workspaces in the sidebar.
Shared channels appear in the channels list under "Organization Channels"
Best Answer
The
symbol next to the channel name on the left panel indicates that the channel is a "multi-workspace channel":
Go to the channel's details panel on the right to see which workspaces have access to the channel:
Example where the entire organization (i.e., all workspaces) has access to the channel: