I must have been dreaming earlier when I thought I could minimise the File Operation Progress box on LL 3.0 by copying to or from another volume other than the system one.
Which means the info I posted earlier isn't correct, my apologies
I guess I had the window/s closed as it will minimise via the panel button when the windows are closed, but it won't otherwise no matter what the source or destination.
The minimise option/button has been removed.
In LL 2.8 it's got a minimise button.

But in LL 3.0 it's missing & the right click option to minimise from the panel button is greyed out.

On my setup (MSI L1350D Notebook) LL 3.0 boots faster from a USB install than my 2.8 does from the hard drive, I'm finding it runs faster than Knoppix 7.6 that's installed on an indentical USB stick, which I think is quite an achievement as nothing I've installed to USB has gone anywhere near Knoppix in speed until now....sweet