It seems that this handy “Quick Access” window does not show the items available via the project explorer. Instead it only allows navigation to items that already have opened editors.
I haven’t found a way to configure this and am starting to suspect this is not yet implemented. But I would love to have a quick way to access workspace items without using the mouse, how do you do that?
Use Ctrl + Shift +R to quickly search and open a file of any types in the workspace
Use Ctrl + Shift +T to quickly search and open the source code of your java classes and the 3rd parties jar that your project uses.