Change behavior for settings panel, it slides instead of grows. That fix the weird render during transition.

static/galene.css

@@ -926,7 +926,8 @@ h1 {
     position: fixed;
     -webkit-transition: all .2s ease-out;
     transition: all .2s ease-out;
-    width: 0px;
+    width: 250px;
+    transform: translateX(100%);
     /* on top of everything */
     z-index: 2999;
     top: 0;
@@ -936,6 +937,10 @@ h1 {
     overflow-y: hidden;
 }
 
+.sidenav.opened {
+    transform: translateX(0);
+}
+
 .sidenav a {
     padding: 10px 20px;
     text-decoration: none;

static/galene.html

@@ -142,7 +142,7 @@
     <div id="sidebarnav" class="sidenav">
       <div class="sidenav-header">
         <h2>Settings</h2>
-        <a class="closebtn" id="clodeside"><i class="fas fa-times" aria-hidden="true"></i></a>
+        <a class="closebtn" id="closeside"><i class="fas fa-times" aria-hidden="true"></i></a>
       </div>
       <div class="sidenav-content" id="optionsdiv">
         <div id="profile" class="profile invisible">

static/galene.js

@@ -3009,12 +3009,8 @@ document.getElementById('disconnectbutton').onclick = function(e) {
     closeNav();
 };
 
-function openNav() {
-    document.getElementById("sidebarnav").style.width = "250px";
-}
-
 function closeNav() {
-    document.getElementById("sidebarnav").style.width = "0";
+    document.getElementById("sidebarnav").classList.remove("opened");
 }
 
 document.getElementById('sidebarCollapse').onclick = function(e) {
@@ -3023,18 +3019,10 @@ document.getElementById('sidebarCollapse').onclick = function(e) {
 };
 
 document.getElementById('openside').onclick = function(e) {
-      e.preventDefault();
-      let sidewidth = document.getElementById("sidebarnav").style.width;
-      if (sidewidth !== "0px" && sidewidth !== "") {
-          closeNav();
-          return;
-      } else {
-          openNav();
-      }
+    document.getElementById("sidebarnav").classList.add("opened");
 };
 
-
-document.getElementById('clodeside').onclick = function(e) {
+document.getElementById('closeside').onclick = function(e) {
     e.preventDefault();
     closeNav();
 };