Thanks for trying it!
When using the layout editing menu, the top part of the menu is for the selected element, and the bottom for the splitter containing it. For instance, if I wanted to remove this widget, I would use the top remove option:
The splitter is what contains the above widget, and removing that will remove it and all it's children.
I haven't yet added title bars for all widgets as it would be very difficult to draw and style them uniformly. For widgets like the library tree, I can add the option however.
You can add and link search widgets to some specific widgets, and it currently filters tracks based on the search terms. I'm designing a language to use for more exact filtering (i.e. album:home), but until then it's limited to searching the main fields of each track.
As mentioned above, I've added an option to send (replace) the tracks in a playlist when opening files. Using File->Add Files will append files without clearing,
Feel free to make feature requests! They're extremely helpful and help me keep track of what I need to implement.
