found it by searching again in this forum for the word
'floating'
got this:
Tip: Re-Docking Resource Windows
In HomeSite you can un-dock or float one or more of the
resource windows easily by double-clicking on the top title area of
the resource window.
However, it's not clear how to re-dock them, and the HS help
doesn't really tell you how either.
To dock them, you'll have to repeat this action for each
resource tab.
Right-mouse-click over the area within each tab and select
Move (tab-name) to Left.
Here are some screen shots illustrating this:
1. Undocking
2. Undocked
3. Redocking
Note that the local file tabs may be floating with just the
folders list showing. You can't get that "Move to Left" menu option
if you click over the folders list, but must drag the bottom down
or the folders/files list separator bar up so you can see the files
list. Then Right click over the files list and select Move Files 1
(or 2) to Left..
For some reason, you may need to re-dock some of the other
tabs like help or snippets before re-docking the Local Files tabs.
See also Ben Forta's tip: Prevent Accidental Resource Tab
Moves.