platform/platform-resources/src/idea/ExternalSystemActions.xml

<component>
  <actions>
    
    
    <action id="ExternalSystem.RefreshAllProjects"
            class="com.intellij.openapi.externalSystem.action.RefreshAllExternalProjectsAction"
            icon="AllIcons.Actions.Refresh"/>
    <action id="ExternalSystem.RefreshProject"
            class="com.intellij.openapi.externalSystem.action.RefreshExternalProjectAction"
            icon="AllIcons.Actions.Refresh"/>
    <action id="ExternalSystem.AttachProject"
            class="com.intellij.openapi.externalSystem.action.AttachExternalProjectAction"/>
    <action id="ExternalSystem.DetachProject"
            class="com.intellij.openapi.externalSystem.action.DetachExternalProjectAction"
            use-shortcut-of="$Delete"/>
    <action id="ExternalSystem.OpenConfig"
            class="com.intellij.openapi.externalSystem.action.OpenExternalConfigAction"
            use-shortcut-of="EditSource"/>

    <!--Tool window actions-->
    <group id="ExternalSystem.ToolWindow.Toolbar">
      <reference id="ExternalSystem.RefreshAllProjects"/>
      <reference id="ExternalSystem.AttachProject"/>
      <reference ref="ExternalSystem.DetachProject"/>
    </group>

    <!--Context menu action-->
    <group id="ExternalSystem.Tree.Context" popup="true">
      <reference ref="ExternalSystem.OpenConfig"/>
      <reference id="ExternalSystem.RefreshProject"/>
      <reference ref="ExternalSystem.DetachProject"/>
      <separator/>
      <reference ref="RunContextGroup"/>
    </group>
    
  </actions>
</component>