rdMeshTools is an Unreal Engine plugin tool that resides in the Static Mesh Editors toolbar and in the Content Browsers Context Menu.

This tool gives you the ability to quickly and easily change any static meshes scale, rotation and pivot point. Finally here is a tool that allows you to make a standard orientation/scale for things such as doors (often oriented to random walls) in your Blueprints or code without needing options for mesh rotation, pivot etc.

It works for single meshes from the editor, or any amount of selected meshes in the content browser.

This tool accesses the raw mesh data directly, and makes the changes there, so is as good as making those changes from your modelling software itself. (If you re-import your mesh, you will need to re-apply your scale/rotation/pivot.)

It is compatible with LOD based StaticMeshes and with Nanite StaticMeshes.

Using rdMeshTools from the Context Menu
Using rdMeshTools from the StaticMesh Editor