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I am pretty sure that after installing 11.10 when an application had two or more windows open and I hovered over a unity bar icon with little white arrows (one for each window), I was getting a window thumbnail for each window of that application.

But I don't see that any more.

Does anyone know how to restore that?

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  1. Be sure to install both compizconfig-settings-manager (CompizConfig Settings Manager or CCSM) and compiz-plugins-extra. You can do this from Ubuntu Software Centre.
  2. Open CCSM > Extras > Enable Window Previews (turn this on) > Taskbar Shows Only Windows Of Current Viewport (uncheck).

Enable Windows Previews in CCSM

This will do as you wish.

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I remember on older ubuntu versions like 11.04 there was a script and it enabled it on side menu, I just can not find it any more – Levan Dec 9 '12 at 23:10
I was wrong. You are correct. I have fixed my reply. Try it and let us know if it works for you. – Paddy Landau Dec 10 '12 at 10:22
I'm running Ubuntu 12.10 and I followed these instructions, but there is no "Enable Window Previews" in the Extras section of ccsm. Why is that? – Muhammad Khan Dec 19 '12 at 21:22

You probably activated scale mode for the open windows by clicking the icon (with multiple windows open), since the window previews are disabled by default (due to a not-so-hot implementation of the feature).

In fact, that plugin does not work so well with Unity, so you would be better off using a dock.

From your comments, it seems like you did something to mess with the settings that has disabled the scale mode. If you don't mind having to add your favourites to the launcher again, you can run:

unity --reset

Also, by the way, installing a dock is simple. Open the Software Center and search for "dock", and then choose one you like. The are some good ones such as Avant Window Navigator, Cairo Dock, and Docky. All three support showing the window previews, but not for multiple windows.

For that, you would need to install DockBarX, and use it in a standalone way.

 sudo add-apt-repository ppa:dockbar-main/ppa
 sudo apt-get update
 sudo apt-get install dockbarx
 sudo apt-get install dockbarx-themes-extra

Then run dockbarx. You can modify the options show that it activates scale mode when there are multiple windows open and you click on it.

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So if they are disabled by default, how do i enable them? how do i use a dock? – Software Development Perth Nov 10 '11 at 9:56
Hang on, I went to compiz config settings manager and activated window preview, but now a preview comes when hovering, not when clicking and it only shows one of the windows of that app... I was refering to a feature that shows a preview of all the windows open for that application... any idea? – Software Development Perth Nov 10 '11 at 10:04
@SoftwareDevelopmentPerth I mentioned it in my answer. When you click the icon of an application that has multiple windows open, you will get a preview of all the open windows. – RolandiXor Nov 10 '11 at 13:40

If you have an app with more than one open window, there are a few ways to display previews. If you have one of that apps windows focused, then you can click the launcher entry once to get a big overview with previews. To switch between windows of a single app, with previews, you can press Alt+BAT (Button Above Tab).

There is no preview on hover by default.

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It doesn't work when doing single click either. Is there any setting to enable/disable this? I was playing with compiz config settings, maybe i stuffed somthing up... – Software Development Perth Nov 10 '11 at 9:05
Make sure that the Scale plugin is enabled in ccsm. If you wish to also get a window title overlay while in the spread (preview) then enable the Scale Addons & Text plugins – doug Nov 10 '11 at 17:56

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