I just launched a new plugin called Vertical Tabs that adds a vertical menu listing all you open tabs.
It should work for every platforms but tested only for windows right now.
https://www.fab.com/listings/198831fc-151f-418c-88d5-08191135a253
Simplify Your Workflow
Are you tired of juggling countless asset tabs in the Unreal Editor, feeling like a circus performer managing flaming batons? 
Say hello to VerticalTabs, the plugin designed to bring order to your chaos and a smile to your face!
Why ?
- Effortless Tab Management: Instantly view all your open assets in a sleek, vertical popup. No more endless scrolling or accidental tab closures!
- One-Shortcut Wonder: Press X (customizable shortcuts) to toggle your VerticalTabs popup. Open it, close it, done. Simple as that.
- Global Accessibility: Whether you’re deep in the Level Editor, tinkering with Blueprints, or crafting Materials or any other tab, VerticalTabs is there for you. It seamlessly integrates across all windows, ensuring consistent performance everywhere.
- Intuitive Design: With a clean, scrollable interface limited to 600 pixels in height, navigating your assets has never been easier—or prettier.
Features That Shine
- Popup Positioning Magic: VerticalTabs intelligently positions itself near your cursor, ensuring it’s always right where you need it—no more hunting for lost windows!
- Lightweight & Performance-Friendly: Built with efficiency in mind, VerticalTabs adds minimal overhead, letting you focus on what you do best—creating amazing games.
Easy Installation & Setup
- Download & Install: Grab VerticalTabs from the Fab Marketplace and install it with a single click.
- Press X & Enjoy: Start using VerticalTabs immediately—no complicated configurations required!
Would like to change the X shortcut ?
- Go to : Edit → Editor Preferences → GENERAL → Keyboard Shortcuts → [Search for Vertical Tabs Plugin]