In short. Enable Disable publishing sites, forms, and public links in Settings → Security to stop members publishing Notion Sites.

Definition: On Notion's Enterprise Plan, a workspace owner can enable Disable publishing sites, forms, and public links in Settings → Security. Notion says that Sites already live on the web are taken down when this setting is enabled.

Key facts

Notion separates publishing a page as a Notion Site from the page's Anyone on the web with link setting. Notion's public-page documentation describes them as different ways to make a page public.
Only a workspace owner on the Enterprise Plan can use the documented control to prevent workspace members from publishing Notion Sites. Notion's public-page documentation names that role and plan.
The control is in Settings → Security and is named Disable publishing sites, forms, and public links. Notion's public-page documentation gives the path and label.
Notion states that any Sites already live on the web are taken down when the setting is turned on. The same setting also prevents members from sharing forms to the web. Notion's public-page documentation
Workspace members can review public pages from Settings → Public pages. Workspace owners can also restrict the ability to publish Notion Sites for the workspace, according to Notion's site management documentation.

Which setting stops publication?

The control applies at workspace level. A workspace owner on an Enterprise Plan opens Settings, selects Security, and enables the setting below:

Settings → Security
Disable publishing sites, forms, and public links

The label is broader than Notion Sites alone. Notion's documentation specifically says that enabling it prevents members from publishing Notion Sites and also prevents members from sharing forms to the web. It does not describe a separate member-level permission in the public-page instructions.

The control is separate from the page-level publishing workflow. Notion documents publishing a Site by opening a page, selecting Share, opening Publish, and selecting Publish. The Site then updates automatically when the content of the published page changes. The Enterprise control changes whether members can use that public-site workflow.

What happens to Sites already online?

Notion states: “Any Sites already live on the web will be taken down once you turn this setting on.” This covers Sites that were already online when the owner enables the control. The documentation also says that enabling the setting prevents members from sharing forms to the web.

This action concerns a published Notion Site. Notion separately warns that unpublishing a Site can leave the page accessible when its Anyone on the web with link general access setting remains enabled. That setting is managed from the page's Share menu. The documentation does not specify whether enabling the Enterprise control also changes that page-level general access setting, so the documented Site takedown and the page's sharing setting should be checked separately.

How can an owner review the workspace's public pages?

Notion's site management page sends workspace members to Settings → Public pages. There they can see workspace domains, Sites available to them through a teamspace, group, parent page, or direct invitation, plus public forms and pages accessible to anyone with a link. They can open a published Site, copy its URL, or open its publishing settings.

The same inventory shows the page name, its associated domain, who published it, and when it was published. Selecting the menu beside a published page opens options to view the page, copy its link, or open its publishing settings. This gives the owner a documented place to inspect the pages affected by the workspace control.

FAQ

Who can stop members publishing Notion Sites?

A workspace owner on Notion's Enterprise Plan can enable the control. The public-page documentation does not assign this control to ordinary workspace members.

Does the setting affect Sites that are already online?

Yes. Notion says that Sites already live on the web are taken down once the setting is turned on. It also prevents members from sharing forms to the web.

Is a Site unpublish the same as removing public-link access?

No. Notion says a page can remain accessible through Anyone on the web with link after its Site is unpublished. Remove that general access setting from the page's Share menu when the page itself should no longer be shared through that link.

Where can an owner inspect published pages?

Open Settings → Public pages. The management page lists the page name, associated domain, publisher, and publication time, with actions for opening the page, copying its link, or opening publishing settings.

Sources

Check how a page reads to answer engines. Open the GEO score analyzer

How can a Notion workspace stop members publishing public sites?