diff --git a/frontend/src/app.js b/frontend/src/app.js
index 1b62a7481..35f4a4da5 100644
--- a/frontend/src/app.js
+++ b/frontend/src/app.js
@@ -109,7 +109,10 @@ const router = new Router({
 });
 
 router.beforeEach((to, from, next) => {
-  if (to.matched.some((record) => record.meta.settings) && config.values.disable.settings) {
+  if (document.documentElement.className) {
+    // Disable back button in full-screen viewers and editors.
+    next(false);
+  } else if (to.matched.some((record) => record.meta.settings) && config.values.disable.settings) {
     next({ name: "home" });
   } else if (to.matched.some((record) => record.meta.admin)) {
     if (isPublic || session.isAdmin()) {
diff --git a/frontend/src/share.js b/frontend/src/share.js
index dfe5f7c10..3f8ffc907 100644
--- a/frontend/src/share.js
+++ b/frontend/src/share.js
@@ -109,7 +109,10 @@ const router = new Router({
 });
 
 router.beforeEach((to, from, next) => {
-  if (to.matched.some((record) => record.meta.settings) && config.values.disable.settings) {
+  if (document.documentElement.className) {
+    // Disable back button in full-screen viewers and editors.
+    next(false);
+  } else if (to.matched.some((record) => record.meta.settings) && config.values.disable.settings) {
     next({ name: "home" });
   } else if (to.matched.some((record) => record.meta.admin)) {
     if (isPublic || session.isAdmin()) {