Hello @Qais Sami,
Below blog post will definitely help you get this done.
Set Default Permissions for New Spaces
Below content is from above blog post.
Confluence Administrator’s now have complete control over the default permissions applied to newly created spaces. When you upgrade to Confluence 4.2.6 you’ll find a new menu item under the Users & Security section of the Confluence Admin console – you guessed it, Default Space Permissions.
Please refer to global permission configuration
https://docs.atlassian.com/confluence/docs-63/Global+Permissions+Overview
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