Hi @JuliaMora15110, I hope I got your question correct:
Can you please go to your Alerts section and click on the alert you want to have more details on, on "Observation"
And then you see the alert again with the time stamp where you can click on "Session Traffic"
Is the next page what you're looking for?
You can also go to this with Monitor > Event Viewer, but then you have to manually drill down to your alert.
Hope this helps,
cheers