diff --git a/x-pack/plugins/ml/public/explorer/styles/main.less b/x-pack/plugins/ml/public/explorer/styles/main.less
index 79b848135ef8d..b3c297821bcbf 100644
--- a/x-pack/plugins/ml/public/explorer/styles/main.less
+++ b/x-pack/plugins/ml/public/explorer/styles/main.less
@@ -116,6 +116,11 @@
   .ml-anomalies-controls {
     padding-top: 5px;
 
+    .ml-select-severity.euiComboBox {
+      // Overrides .euiComboBox z-index to ensure it appears below the job picker.
+      z-index: 0;
+    }
+
     #show_charts_checkbox_control {
       padding-top: 28px;
     }