@PeterJones
I don’t, normally, do this myself as well but I think I found a way to reproduce it more or less easily.
Preparation:
open
function list and
folder as workspace(faw) dialogs
ctrl+f
click find tab
press find all in all opened documents button
Now click on a dialog title bar and throw, that is move the mouse quickly and release the mouse button, the dialog to another dialog as seen in the animation.
In the gif you can see that I tried to throw the faw dialog onto the search results dialog, which failed, instead it opened
as a floating dialog box. I double clicked on the header so that the dialog is put back in its original position.
EDIT: used a new portable 8.4.6 version, no additional plugins.