When default do not disturb (DND) hours are set for a workspace or Enterprise Grid organisation, Slack will not send any desktop or mobile notifications to members during those hours. Setting default DND hours will affect all members of a workspace or org unless they set up their own DND schedule.
Add default do not disturb hours
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Enterprise Grid subscription
Here's how workspace owners and admins can set default DND hours:
Click your workspace name in the sidebar.
Hover over Tools & settings, then click Workspace settings.
Scroll down to Do not disturb and click on Expand.
Select the default hours when members will not receive notifications.
Click on Save.
Org level
Org owners and org admins can add an org policy to set default DND hours for all workspaces in an org:
Click your organisation name in the sidebar.
Hover over Tools & settings, then click Organisation settings.
Click Settings in the left column. Then, click Organisation policies.
Next to When to pause notifications, click Add policy.
Tick the box next to Disable notifications during specific hours and select the default hours when members will not receive notifications.
Click Save policy.
Workspace level
Here's how workspace owners and workspace admins can set default DND hours:
Click your organisation name in the sidebar.
Hover over Tools & settings, then click Workspace settings.
Scroll down to Do not disturb and click on Expand.
Select the default hours when members will not receive notifications.
Click on Save.
Note: When you set default do not disturb hours, members will still be able to change their own hours, set a DND schedule or turn DND off.