If you select to show the separate popup window for the memory registers, you add another option to the store/recall processes; the panes that appear with the memory contents can be clicked for store/recall as follows:
The popup window does not have any caption, but to move the window you can click/drag anywhere within the popup, or resize by click/dragging the lower corners.
Note: The keyboard shortcut key Ctrl-N will quickly toggle the display of the popup window, without affecting the setup.
See also: