Show only json calls in network tab
You may also filter by Content-Type/mime-type: mime-type:application/json
See Sorting and filtering and Network Filters
You can click on XHR to show your ajax calls, is that what you are looking for?
Go to the Network tab in the developer console, and then click XHR at the bottom to filter by this.
I think you want to use this highlighted option to view only XHR requests.
