Don't open FLD library HUDs in the top orientation

Resolves #16747

Author: brandonkelly

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## Unreleased
 
 - Fixed a bug where scrollable panes weren’t automatically scrolling when dragging objects near their edges. ([#16738](https://github.com/craftcms/cms/issues/16738))
+- Fixed a bug where field layout designers’ library HUDs could open above the “Add” button, hiding the tab contents. ([#16747](https://github.com/craftcms/cms/discussions/16747))
 
 ## 5.6.8 - 2025-02-19
 

src/web/assets/cp/dist/cp.js

@@ -474,6 +474,7 @@ Craft.FieldLayoutDesigner.Tab = Garnish.Base.extend({
       hudClass: 'hud fld-library-hud',
       listenToMainResize: false,
       showOnInit: false,
+      orientations: ['right', 'bottom', 'left'],
     });
     hud.on('show', () => {
       this.designer.$libraryContainer.appendTo(hud.$main);