Sometimes you will not see Site Pages link under Look and Feel in Site Settings. Here we will discuss how we can bring back Site Pages link.
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Open SharePoint site, from the right side click on Settings icon and then click on Site Settings.
Under Site Actions click on "Manage site features".
Then in the Site Features page, search for "Wiki Page Home Page" feature and click on Activate.
Go to Site Settings > Under Look and Feel Click on Welcome Page. It will appear like below: