In TOAD and SQL Workbench/J I'm used to have a multitude of editor tabs, but in DBE I can't quite figure out how to open more than one. File->New File is greyed out. I hunted through the rest of the menus and right-clicked on everything in sight and didn't find any other way of opening a new tab or file.
The one thing I did find is that I can use File->Open to open a file, though it gives me a warning about that file not belonging to the Project. After dismissing that warning, I can write and run queries in that file. This works, I guess, but the workflow is terrible. I don't have a concept of Project when it comes to writing SQL nor do I want one. I don't even want to explicitly save my work in files most of the time. I just want editor tabs where I can write and run SQL -- just like I can in TOAD and SQL Workebench/J -- and I want them to auto-save to temp files that I don't need to care about.