As per your query, you want to open hidden apps, we would like to inform you that you have to un-hide the hidden apps to use the application. Please follow the below-mentioned quick steps and by following these steps your concern should be resolved.
To un-hide the app: Go to menu apps>tap on Settings>Tap on home screen>Select Hide Apps>Tap on the application you would like to hide>Tap on the Remove (-) icon on the hidden app to remove it from the list of hidden apps. Finally, tap on Done to save your changes> Then select Done to apply the changes.
