Thanks for becoming part of the Community and getting involved with this thread, DJaxn.

You can still duplicate estimates and invoices with your new layout. Instead of "Duplicate", the option is now titled "Make a copy".

Here's how to make a duplicate of an existing estimate:
 

1. In the left navigation bar, go to Sales, then All sales.
2. Find your estimate and click its Edit option.
3. Hit Manage to open the settings panel.
4. From your Action box, use the Drop-Down Arrow (▼) icon.
5. Choose Make a copy.
6. Make any necessary changes to your new estimate.
7. Select Save.

I've also included a few detailed resources about working with estimates which may come in handy moving forward: 
 

• Duplicate an estimate
• Customize sales forms
• See what’s new with estimates

I'll be here to help if there's any additional questions. Have a great Friday!