I got this question and wanted to share the solution.
I am missing my sheet set manager window. I wanted to ask if you had any tips on getting it to return. Type SSM, command line acts like its visible but its not. I feel like its minimized somewhere but I cant find it. Any pointers would be greatly appreciated.
Examples of windows or palettes that can disappear (usually outside the visible area of the screen) are Sheet Set Manager (SSM), Design Feed, Tool Palette, Layer Properties Manager, DesignCenter (ADC), External References (Xref ESW), Markup Set Manager, Visual Styles Manager, command line, Quickcalc, Object Properties (OPM), Drawing Recovery Manager, Block Authoring Palette, Parameters Manager. You can fix or edit the coordinates of these in either FixedProfile.aws or Profile.aws files. These files are XML files and can be edited in an XML editor or Notepad.
You can also delete the file as AutoCAD will create a new one with the default settings next time AutoCAD is run.
Only edit this file when AutoCAD is not running. Make a backup of it just in case.
AutoCAD 2014\R19.1\enu are parts of the path that is different depending on AutoCAD version, vertical and language.
<Profile> is the name of the AutoCAD profile. Default is “Unnamed Profile”.
Wondering what %APPDATA% is?
In XP: C:\Documents and Settings\%username%\Application Data
In Vista/W7/W8/W8.1: C:\Users\%username%\AppData\Roaming
Here is an example of a small part of what it might look like in the aws file:
<CAdUiDockControlBar Orientation="-1" AllowDocking="1">
<FloatInfo Left="44" Top="208" Width="230" Height="384"/><DockInfo Left="0" Top="0" Width="0" Height="0" MRUDockID="0"/></CAdUiDockControlBar>
<CAdUiPaletteSet ActivePaletteIndex="0" TitleBarLocation="0" AutoRollup="1" Name="Sheet Set Manager" Style="46" Opacity="100" RolloverOpacity="100" Visible="1"/>
And it is quite obvious that the location of the palette is determined by Left and Top values.
Tawfik mentioned in a comment also another solution. Start a command that shows the palette in question, hold down Alt and press Space, then press M and finally use the arrows to move the palette.