You are currently in the site settings interface of a top-level site, the top-level site doesn’t have a parent site so it can't display the same navigation items as a subsite site.
You can enable this option in a subsite. If you are in a subsite, it will display as below:
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okay I see, but how can i quick edit in the navigation without opening a new page – Mohamed Lotfy Sep 24 '20 at 9:20
For Site collection does not have the parent, so navigation will not inherit from parent. But in the subsite this option must be enabled because subsite have the parent site