How can I listen to only one IP and ignore the rest?
The filters, including the Remote IP column shown in the screenshot, can be used to filter your traffic based on the given criteria.
For example, if you use a Remote IP filter with Contains and a value of 220.127.116.11, then in the Live Traffic session list, you will see only traffic coming from 18.104.22.168 (example.com). Note that the filters are simply Filtering the Live Traffic list - Fiddler still acts as a system proxy and captures everything that passes through it.
Refer to my attachment