When space numbering is enabled, all pages within the space will have page numbering enabled. Space numbering is an option for space admins to easily enable Numbered Headings on a page.
Users don't have any influence on space numbering. For example: It's not possible to disable page numbering for specific pages within a space with space numbering.
Login as an administrator or space admin.
Navigate to Space tools and choose Add-ons or Apps.
Choose the Numbered Headings tab.
Enable / disable the toggle on this page.