How to Enable Power Saving Mode in Galaxy S4
Other than Power Saving Apps, Samsung Galaxy S4 has a built in Power Saving mode and you can enable CPU Power Saving, Screen power saving, Turn off ...
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Is there the Accessibility shortcut, when you press and hold the power key to open device options? See how to remove accessibility shortcut on Galaxy Grand and other Samsung Android devices which support this option by doing as follows.
1. Open "Setting" app
2. Go to "Accessibility"
3. Make sure "Accessibility" shortcut is not marked. (To add the accessibility shortcut under device options, you just need to check the option)