You can limit the number of properties panels that can be open in the Properties Bin. To do so, enter the maximum number of properties panels in the field on the Properties Bin.
To lock the Properties Bin and have all new properties panels appear in floating windows, click the lock button on the Properties Bin.
To empty the Properties Bin and close all the properties panels in it, click the remove all panels button.
TIP: You can also close all the properties panels in the Properties Bin by Alt+clicking on the close (X) button of one of the panels.