fix: if handbook is clicked, all its sections should appear

assets/js/box_hider.js

@@ -75,11 +75,19 @@ window.boxHider = (function() {
         HideAllCategories();
         // Finally, hide all boxes except of the selected one
         var allBoxes = GetAllBoxElementsArray();
-        allBoxes.map(function(box) {
-            if (box != selectedBox) {
-                HideElement(box);
-            }
-        });
+        if (boxId.startsWith('handbook')) {
+            allBoxes.map(function(box) {
+                if (!box.id.startsWith('handbook')) {
+                    HideElement(box);
+                }
+            });
+        } else {
+            allBoxes.map(function(box) {
+                if (box != selectedBox) {
+                    HideElement(box);
+                }
+            });
+        }
     }
 
     return {