Use the Advanced Network Panel Filtering feature to narrow down resources to exactly what you want to find. For example:
larger-than:100will find and filter for resources larger than 100 bytes
-larger-than:50kto find resources which are not larger than 50k.
status-code:200to find resources with a status code response of
A few other queries which you can experiment with:
Note: you get autocomplete for these, it makes it easier to discover query types and their corresponding values. The values which autocomplete will exist in your current network recording.