diff --git a/packages/pdfjs-viewer/src/custom.ts b/packages/pdfjs-viewer/src/custom.ts
index 9defae5264..5c2eaa892d 100644
--- a/packages/pdfjs-viewer/src/custom.ts
+++ b/packages/pdfjs-viewer/src/custom.ts
@@ -18,6 +18,8 @@ async function main() {
         interceptPersistence(getCustomAppOptions(urlParams));
     }
 
+    configurePdfViewerOptions();
+
     // Wait for the PDF viewer application to be available.
     while (!window.PDFViewerApplication) {
         await new Promise(r => setTimeout(r, 50));
@@ -39,6 +41,19 @@ async function main() {
     await app.initializedPromise;
 };
 
+function configurePdfViewerOptions() {
+    const pdfOptionsHandler = (event: CustomEvent) => {
+        if (event.detail?.source === window && window.PDFViewerApplicationOptions) {
+            window.PDFViewerApplicationOptions.set("disablePreferences", true);
+            window.PDFViewerApplicationOptions.set("enableHighlightFloatingButton", true);
+        }
+    };
+    if (window.parent && window.parent !== window) {
+        window.parent.addEventListener("webviewerloaded", pdfOptionsHandler, { once: true });
+        window.addEventListener("pagehide", () => window.parent?.removeEventListener("webviewerloaded", pdfOptionsHandler));
+    }
+}
+
 function hideSidebar() {
     window.TRILIUM_HIDE_SIDEBAR = true;
     const toggleButtonEl = document.getElementById("viewsManagerToggleButton");
diff --git a/packages/pdfjs-viewer/src/typings.d.ts b/packages/pdfjs-viewer/src/typings.d.ts
index 50ac44fc07..db12b178d0 100644
--- a/packages/pdfjs-viewer/src/typings.d.ts
+++ b/packages/pdfjs-viewer/src/typings.d.ts
@@ -46,5 +46,6 @@ declare global {
             };
             store: ViewHistory;
         };
+        PDFViewerApplicationOptions?: { set(name: string, value: any): void; }
     }
 }