diff --git a/airflow-core/src/airflow/ui/src/queries/useGridRuns.ts b/airflow-core/src/airflow/ui/src/queries/useGridRuns.ts
index fe6340f08ad86..9a359e6f5d608 100644
--- a/airflow-core/src/airflow/ui/src/queries/useGridRuns.ts
+++ b/airflow-core/src/airflow/ui/src/queries/useGridRuns.ts
@@ -56,6 +56,15 @@ export const useGridRuns = ({
     value: runIdPattern,
   });
 
+  // Advanced-search toggle picks between the substring ``triggeringUser`` and the
+  // index-friendly ``triggeringUserPrefix`` variants of the Triggering User filter.
+  const triggeringUserArg = useAdvancedSearchArg({
+    patternApiKey: "triggeringUser",
+    prefixApiKey: "triggeringUserPrefix",
+    storageKey: SearchParamsKeys.TRIGGERING_USER_NAME_PATTERN,
+    value: triggeringUser,
+  });
+
   const { data: GridRuns, ...rest } = useGridServiceGetGridRuns(
     {
       dagId,
@@ -67,7 +76,7 @@ export const useGridRuns = ({
       ...runIdPatternArg,
       runType: runType ? [runType] : undefined,
       state: dagRunState ? [dagRunState] : undefined,
-      triggeringUser: triggeringUser ?? undefined,
+      ...triggeringUserArg,
     },
     undefined,
     {
diff --git a/airflow-core/src/airflow/ui/src/queries/useGridStructure.ts b/airflow-core/src/airflow/ui/src/queries/useGridStructure.ts
index 702145b2bf55d..b2fb353330a3d 100644
--- a/airflow-core/src/airflow/ui/src/queries/useGridStructure.ts
+++ b/airflow-core/src/airflow/ui/src/queries/useGridStructure.ts
@@ -59,6 +59,15 @@ export const useGridStructure = ({
     value: runIdPattern,
   });
 
+  // Advanced-search toggle picks between the substring ``triggeringUser`` and the
+  // index-friendly ``triggeringUserPrefix`` variants of the Triggering User filter.
+  const triggeringUserArg = useAdvancedSearchArg({
+    patternApiKey: "triggeringUser",
+    prefixApiKey: "triggeringUserPrefix",
+    storageKey: SearchParamsKeys.TRIGGERING_USER_NAME_PATTERN,
+    value: triggeringUser,
+  });
+
   // This is necessary for keepPreviousData
   const { data: dagStructure, ...rest } = useGridServiceGetDagStructure(
     {
@@ -72,7 +81,7 @@ export const useGridStructure = ({
       ...runIdPatternArg,
       runType: runType ? [runType] : undefined,
       state: dagRunState ? [dagRunState] : undefined,
-      triggeringUser: triggeringUser ?? undefined,
+      ...triggeringUserArg,
     },
     undefined,
     {