Fix layout shift

ui/scss/component/_main.scss

@@ -105,17 +105,31 @@ body {
 .main--file-page {
   width: 100%;
   max-width: var(--page-max-width--filepage);
-  margin-left: auto;
-  margin-right: auto;
   margin-top: var(--spacing-m);
   padding: 0 var(--spacing-m);
+  position: relative;
+
+  @media (min-width: $breakpoint-medium) {
+    $recommended-width: calc(var(--recommended-content-width) - var(--spacing-l) * 3 - var(--spacing-m) * 2);
+
+    display: grid;
+    grid-template-columns: 1fr $recommended-width;
+    justify-content: space-between;
+    gap: var(--spacing-l);
+
+    .file-page__recommended {
+      margin: 0 !important;
+      height: 100% !important;
+      width: 100% !important;
+    }
+  }
+
+  @media (max-width: $breakpoint-medium) {
+    margin-left: auto;
+    margin-right: auto;
     display: flex;
     flex-direction: row;
     align-items: flex-start;
-  position: relative;
-
-  > :first-child {
-    flex-grow: 2;
   }
 
   .file-page__secondary-content {

ui/scss/init/_vars.scss

@@ -53,6 +53,7 @@
   --mobile: 600px;
   --side-nav-width: 230px;
   --side-nav-width--micro: 93px;
+  --recommended-content-width: 32rem;
 
   --spacing-main-padding: var(--spacing-xl);
   --floating-viewer-width: 32rem;