How to to turn off security delay on iPhone
I’m at home and need privacy delay off
[Re-Titled by Moderator]
Know more --> About Stolen Device Protection for iPhone
See the pic below which is self-explanatory
Probably you have "Always" Ticked in place of "Away from Familiar Location"
For enhanced security, there's a one-hour delay when changing your location settings from "Always" to "Away from Familiar Location." This applies even if you use Face ID for authentication.
A delay will be required when you are not at a familiar location, such as your home or work, to change security settings.