Learn Editor: Update investigate-alerts.md

Author: diannegali

defender-xdr/investigate-alerts.md

@@ -40,7 +40,7 @@ The **Alerts queue** shows the current set of alerts. You get to the alerts queu
 
 Alerts from different Microsoft security solutions like Microsoft Defender for Endpoint, Defender for Office 365, Microsoft Sentinel, Defender for Cloud, Defender for Identity, Defender for Cloud Apps, Defender XDR, App Governance, Microsoft Entra ID Protection, and Microsoft Data Loss Prevention appear here.
 
-By default, the alerts queue in the Microsoft Defender portal displays the new and in progress alerts from the last seven days. The most recent alert is at the top of the list so you can see it first.
+By default, the alerts queue in the Microsoft Defender portal displays the new and in progress alerts from the last seven days. The most recent alert is at the top of the list so you can see it first. You can also find the **total number of alerts** in the queue indicated beside the Search bar. The total number of alerts varies depending on the filters used in the queue.
 
 From the default alerts queue, you can select **Filter** to see all available filters from which you can specify a subset of the alerts. Here's an example.