diff --git a/src/gui/src/UI/UIWindowClaimReferral.js b/src/gui/src/UI/UIWindowClaimReferral.js
index e601068ac..4e8ec0925 100644
--- a/src/gui/src/UI/UIWindowClaimReferral.js
+++ b/src/gui/src/UI/UIWindowClaimReferral.js
@@ -47,8 +47,6 @@ async function UIWindowClaimReferral(options){
         init_center: true,
         allow_native_ctxmenu: true,
         allow_user_select: true,
-        onAppend: function(el_window){
-        },
         width: 400,
         dominant: true,
         window_css: {
diff --git a/src/gui/src/UI/UIWindowItemProperties.js b/src/gui/src/UI/UIWindowItemProperties.js
index 003f9dceb..c7a907d3a 100644
--- a/src/gui/src/UI/UIWindowItemProperties.js
+++ b/src/gui/src/UI/UIWindowItemProperties.js
@@ -74,8 +74,6 @@ async function UIWindowItemProperties(item_name, item_path, item_uid, left, top,
         left: left,
         top: top,
         height: height,
-        onAppend: function(el_window){
-        },
         width: 450,
         window_class: 'window-item-properties',
         window_css:{
diff --git a/src/gui/src/UI/UIWindowLoginInProgress.js b/src/gui/src/UI/UIWindowLoginInProgress.js
index 1285bb9df..65e74633b 100644
--- a/src/gui/src/UI/UIWindowLoginInProgress.js
+++ b/src/gui/src/UI/UIWindowLoginInProgress.js
@@ -69,8 +69,6 @@ async function UIWindowLoginInProgress(options){
             show_in_taskbar: false,
             backdrop: true,
             stay_on_top: true,
-            onAppend: function(this_window){
-            },
             window_class: 'window-login-progress',
             body_css: {
                 width: 'initial',
diff --git a/src/gui/src/UI/UIWindowMyWebsites.js b/src/gui/src/UI/UIWindowMyWebsites.js
index c03f18799..5684562bd 100644
--- a/src/gui/src/UI/UIWindowMyWebsites.js
+++ b/src/gui/src/UI/UIWindowMyWebsites.js
@@ -45,10 +45,6 @@ async function UIWindowMyWebsites(options){
         allow_user_select: true,
         width: 400,
         dominant: false,
-        onAppend: function(el_window){
-        },
-        window_css:{
-        },
         body_css: {
             padding: '10px',
             width: 'initial',
diff --git a/src/gui/src/UI/UIWindowQR.js b/src/gui/src/UI/UIWindowQR.js
index d784efd2a..ab67d6c66 100644
--- a/src/gui/src/UI/UIWindowQR.js
+++ b/src/gui/src/UI/UIWindowQR.js
@@ -61,8 +61,6 @@ async function UIWindowQR(options){
         dominant: true,
         show_in_taskbar: false,
         draggable_body: true,
-        onAppend: function(this_window){
-        },
         window_class: 'window-qr',
         body_css: {
             width: 'initial',
diff --git a/src/gui/src/UI/UIWindowRefer.js b/src/gui/src/UI/UIWindowRefer.js
index 562420fa5..bb7d4d28c 100644
--- a/src/gui/src/UI/UIWindowRefer.js
+++ b/src/gui/src/UI/UIWindowRefer.js
@@ -52,8 +52,6 @@ async function UIWindowRefer(options){
         init_center: true,
         allow_native_ctxmenu: true,
         allow_user_select: true,
-        onAppend: function(el_window){
-        },
         width: 500,
         dominant: true,
         window_css: {
diff --git a/src/gui/src/UI/UIWindowSearch.js b/src/gui/src/UI/UIWindowSearch.js
index e9f807431..d92c96b40 100644
--- a/src/gui/src/UI/UIWindowSearch.js
+++ b/src/gui/src/UI/UIWindowSearch.js
@@ -51,8 +51,6 @@ async function UIWindowSearch(options){
         window_class: 'window-search',
         backdrop: true,
         center: isMobile.phone,
-        onAppend: function(el_window){
-        },
         width: 500,
         dominant: true,
 
diff --git a/src/gui/src/UI/UIWindowSessionList.js b/src/gui/src/UI/UIWindowSessionList.js
index 5ee581f97..ac5b3457a 100644
--- a/src/gui/src/UI/UIWindowSessionList.js
+++ b/src/gui/src/UI/UIWindowSessionList.js
@@ -69,8 +69,6 @@ async function UIWindowSessionList(options){
             show_in_taskbar: false,
             update_window_url: false,
             cover_page: options.cover_page ?? false,
-            onAppend: function(this_window){
-            },
             window_class: 'window-session-list',
             body_css: {
                 width: 'initial',
diff --git a/src/gui/src/UI/UIWindowWelcome.js b/src/gui/src/UI/UIWindowWelcome.js
index b64e33866..92c56646f 100644
--- a/src/gui/src/UI/UIWindowWelcome.js
+++ b/src/gui/src/UI/UIWindowWelcome.js
@@ -68,8 +68,6 @@ async function UIWindowWelcome(options){
         show_in_taskbar: false,
         draggable_body: true,
         fadeIn: 1000,
-        onAppend: function(this_window){
-        },
         window_class: 'window-welcome',
         on_close: function(){
             // save the fact that the user has seen the welcome window