"System hostname : IP" How to change the IP address ?

Dear genius,
I spend lot of time to read documentation but i don’t find where to modify the IP address. I’ve 5 IP address, i don’t know why, the main address changed by an alternative address.

I need to go back the good one.

Where should i’ve to go for it ?
Here a screenshot :
https://ibb.co/NrM9d2c