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Apps like Nova Launcer, Apex Launcer, etc (apps used to customize the looks of your phone).
Click on the link in my previous message (on the phrase "safe mode").
If it works on safe mode, and not on normal mode, then there's an app that prevents you from doing so. Of course we can't know which app does this unless you uninstall them one by one and test if the option in clickable after each app you uninstall. Sounds like a difficult job, but the other way is to wipe/reset your phone and start from the scratch.