SharePoint Designer Settings
SharePoint Designer Settings:
In this article I am explaining the Options that we can see on SharePoint Designer settings for better understanding and what option do what exactly
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Enable SharePoint Designer — Determines whether SharePoint Designer can be used at all
Enable Detaching Pages from the Site Definition — Allows edited pages to be customized and detached from the site definition
Enable Customizing Master Pages and Layout Pages — Removes the Master Page link from the Navigation pane and prevents the ability to update master pages and layout pages
Enable Managing of the Web Site URL Structure — Removes the All Files link from the Navigation pane
Note: I resolved the issue by above Method. If you find a different solution, please report it as a comment to this post. This will be useful to SharePoint Community. Be sure to double-verify it: undo your solution and verify that the problem comes back, then redo it and verify that the problem goes away.