How can I listen to only one IP and ignore the rest?
Refer to my attachment
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 126.96.36.199, then in the Live Traffic session list, you will see only traffic coming from 188.8.131.52 (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.