diff --git a/apps/red-ui/src/app/modules/pdf-viewer/services/pdf-viewer.service.ts b/apps/red-ui/src/app/modules/pdf-viewer/services/pdf-viewer.service.ts
index 5be425c50..87ce5cff8 100644
--- a/apps/red-ui/src/app/modules/pdf-viewer/services/pdf-viewer.service.ts
+++ b/apps/red-ui/src/app/modules/pdf-viewer/services/pdf-viewer.service.ts
@@ -115,6 +115,11 @@ export class PdfViewer {
         return page$.pipe(map(page => this.#adjustPage(page)));
     }
 
+    get #searchInput() {
+        const iframeWindow = this.#instance.UI.iframeWindow;
+        return iframeWindow.document.getElementById('SearchPanel__input') as HTMLInputElement;
+    }
+
     activateSearch() {
         this.#instance.UI.searchTextFull('', this.searchOptions);
     }
@@ -292,13 +297,13 @@ export class PdfViewer {
 
     #listenForShift() {
         this.#instance.UI.iframeWindow.addEventListener('keydown', e => {
-            e.preventDefault();
+            if (e.target === this.#searchInput) return;
             if (e.key === 'Shift') {
                 this.#setSelectionMode(SelectionModes.RECTANGULAR);
             }
         });
         this.#instance.UI.iframeWindow.addEventListener('keyup', e => {
-            e.preventDefault();
+            if (e.target === this.#searchInput) return;
             if (e.key === 'Shift') {
                 this.#setSelectionMode(SelectionModes.STRUCTURAL);
             }
@@ -395,13 +400,11 @@ export class PdfViewer {
         if (this.#isElementActive('textPopup')) {
             this.#instance.UI.closeElements(['textPopup']);
         }
-        const iframeWindow = this.#instance.UI.iframeWindow;
-        const input = iframeWindow.document.getElementById('SearchPanel__input') as HTMLInputElement;
-        if (input) {
-            input.focus();
+        if (this.#searchInput) {
+            this.#searchInput.focus();
         }
-        if (input?.value?.length > 0) {
-            input.select();
+        if (this.#searchInput?.value?.length > 0) {
+            this.#searchInput.select();
         }
     }