How can I make Unity 2D launcher icons smaller?
Is it possible to change the icon sizes of the buttons in the launcher used in Unity 2D?
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At this moment, here is no way to change the launcher width in Unity 2D, as you can read here:
I suggest to register to this bug on launchpad, that is the related feature request:
Note: the are few other options you can choose, see question How do I configure Unity 2D?
You might actually not need to be using Unity 2D. I found that if I tried to log in to just ubuntu I would get just the background but no Unity 3D; 2D log in worked fine. However if after downloading Gnome-shell I could log into "Classic no effects" then in a terminal window type "Unity" and I can get the Unity 3D shell working that way and be able to change icon size etc from compiz. I'm sure there's a more elegant way of doing this but the workaround worked for me.