[Request][Serverless & 8.15]: Expandable flyout setting being removed from advanced settings (#5292)

Author: nastasha-solomon

docs/detections/alerts-view-details.asciidoc

@@ -13,8 +13,6 @@ image::images/open-alert-details-flyout.gif[Expandable flyout, 90%]
 
 Use the alert details flyout to begin an investigation, open a case, or plan a response. Click **Take action** at the bottom of the flyout to find more options for interacting with the alert.
 
-NOTE: To use the simplified alert details flyout design from {elastic-sec} 8.9 and earlier, turn off the <<enable-expandable-flyout,`securitySolution:enableExpandableFlyout`>> advanced setting. 
-
 [discrete]
 [[alert-details-flyout-ui]]
 == Alert details flyout UI 

docs/getting-started/advanced-setting.asciidoc

@@ -103,12 +103,6 @@ Security *Overview* page.
 * `securitySolution:newsFeedUrl`: The URL from which the security news feed content is
 retrieved.
 
-[discrete]
-[[enable-expandable-flyout]]
-== Display the expandable flyout
-
-The `securitySolution:enableExpandableFlyout` setting enables the expandable alert details flyout on the Alerts page. This setting is turned on by default. Turn it off to apply the simplified alert details flyout design that was used in {elastic-sec} 8.9 and earlier.
-
 [discrete]
 [[enable-asset-criticality]]
 == Enable asset criticality workflows

docs/serverless/alerts/view-alert-details.mdx

@@ -15,10 +15,6 @@ To learn more about an alert, click the **View details** button from the Alerts
 
 Use the alert details flyout to begin an investigation, open a case, or plan a response. Click **Take action** at the bottom of the flyout to find more options for interacting with the alert.
 
-<DocCallOut title="Note">
-To use the simplified alert details flyout design, turn off the <DocLink slug="/serverless/security/advanced-settings" section="display-the-expandable-flyout">`securitySolution:enableExpandableFlyout`</DocLink> advanced setting. 
-</DocCallOut>
-
 <div id="alert-details-flyout-ui"></div>
 
 ## Alert details flyout UI 

docs/serverless/settings/advanced-settings.mdx

@@ -126,12 +126,6 @@ You can change these settings, which affect the news feed displayed on the
 * `securitySolution:newsFeedUrl`: The URL from which the security news feed content is
     retrieved.
 
-<div id="enable-expandable-flyout"></div>
-
-## Display the expandable flyout
-
-The `securitySolution:enableExpandableFlyout` setting enables the expandable alert details flyout on the Alerts page. This setting is turned on by default. Turn it off to apply a simplified alert details flyout design. 
-
 ## Enable asset criticality workflows
 
 The `securitySolution:enableAssetCriticality` setting determines whether asset criticality is included as a risk input to entity risk scoring. This setting is turned off by default. Turn it on to enable asset criticality workflows and to use asset criticality as part of entity risk scoring.