Xperia assist functions

[Chea_Chandarin]

Hi how can I check this checkbox? As picture below 

[najodleglejszy · Accepted solution]

@Chea_Chandarinit's because you have "set ringtone volume" activated lower on the same list. you can't have ringtone volume set to 100% AND have the phone in Do Not Disturb mode at the same time, they cancel each other out