I wanted to share a custom editor layout with a friend which required a bit of digging, but here’s how to do it!
Sharing Your Layout
Anytime you save your current editor layout via View > Layouts > Save Layout… it will be saved into Lumberyard’s Windows registry.
Do a Windows search for RegEdit and open RegEdit.
HKEY_CURRENT_USER > SOFTWARE > Amazon > Lumberyard > Editor > fancyWindowLayouts
(Once you select the fancyWindowsLayouts folder, you should see your different editor layout configurations)
With the fancyWindowsLayouts folder still highlighted click File > Export and save the .reg file.
This *.reg file can be shared with friends (or enemies if you’ve intentionally created an awful layout, muhaha). To import the editor layout open RegEdit and click File > Import… and provide the path the shared *.reg. Next time you open Lumberyard, you’ll be able to switch to your new layouts (View > Layouts).