You can change it in Host & Parameters then search for ping and change it there. You’ll have option to adjust the millisecond threshold and also the packet loss %
yes but you have the warning threshold at 80%… so you’ll get warning once it reaches that value.
Try to increase for what you consider normal to your environment.
Although I would advise you to setup a distributed monitoring, having a master instance and then a slave on the other office, it will help to be more precise with monitoring.