Take the 2-minute tour ×  It appears that support had been
dropped for configuring the dash size in the latest Unity
release, and now the Desktop option has no effect (i.e. Netbook
size is always used).  Just to illustrate, this is what I get
regardless of the screen size or the configuration:   I have
tried to set it via Ubuntu Tweak, like so (see Dash size):   And
the Unity Tweak Tool is already ignoring that option altogether:
What's more, the form-factor entry is missing from dconf-editor:
I really like a. having the dash spreading on my entire desktop,
and b. being able to configure it (!). Is it really gone?
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accepted  It seems that 13.04 has moved to Unity 3D out-of-the-
box, and hence no 2D features (like Dash size) are available.
The only way, than, to change the dash layout would be to
maximize / restore it via the window handles on top:
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