From the release notes:
■ It is now possible to save your UI layout/options between different characters, accounts, computers, and monitor resolutions! As of Update 14, when you log in for the first time you will initially find all UI layouts back at their default positions and sizes. To create and save a custom layout: 1. Arrange your UI to your preferred layout and options for that character
2. Save those settings locally by using “/ui layout save [filename]” in the chat window.
3. Replace "[filename]" with an easy to remember name for that layout. ■ If you don’t specify a filename, then your layout will be saved under, or loaded from, the name Default_.layout. For example, if you are running in 1440x900 resolution, your UI layout file will be "Default_1440_900.layout."
4. You may save as many layouts as you like for any of your characters. Be sure to use different names so as not to overwrite an existing layout.
■ To load a UI file, type "/ui layout load [filename]" in the chat window.
■ Your UI layout files save to your Dungeons & Dragons Online -> data -> ui -> layouts folder. You may copy your ui layout files from this folder into other computers if you like, though we recommend that you make a new layout if the monitor resolution between those computers differs.