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This looks like you do not have "restrict pages" permission at the space level. Go to space admin and permissions and take a look. You'll need an existing space admin to grant you the restrict permission (you may already be one, in which case, you'll be in the right place to amend your own permissions)
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It sounds like you need to change restriction permission for that space.
See https://confluence.atlassian.com/doc/permissions-and-restrictions-139557.html for more information.
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Hello and welcome, @Nadia Howard
If you mean collaborative editing, you can find the documentation here https://confluence.atlassian.com/doc/collaborative-editing-858771779.html
Or did you mean something else?
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