Hi @Wimpy (et al.),
What are thoughts on reducing the large "Installation has finished..." notification window by simplifying the text a little? Current notification fills the entire screen width on a 1280x800 resolution display (can be checked in VirtualBox).
In case helpful, I've created a GIMP mock-up (apart from text changes, also removing a little space between "i" Information icon and text).
Before:
After:
In case the idea is approved, here's the text to save typing it.
Installation has finished.
You can continue testing Ubuntu MATE, but until you restart the computer, any changes made or documents saved will not be preserved.
Thank you.