Hello guys! In my old mobile, I had installed an app (I believe it was a battery manager or something similar) wich had also a mode similar to the extreme save battery mode that the s5 has, a black screen with only call, sms and other few options and everything else deactivated. You could access this mode not from the settings of the phone but from the app menu if I remeber correctly, it had a dedicated icon (just like it was another separate app) but was not a launcher.
Do you know what app could it be?
Thank you very much!