Well I came accross the same issue in 8.04. What I wanted to do was take
some screen shots of an application at a low screen resolution so that
when I added these to an open office presentation they would be visible
and readable from the back of the room. Naturally, I assumed everything
would just work and dived into a graphics mode with 400x300 pixels.

Once I had done that I was truly stuffed. If I had known the  xrand
command, that would have fixed it but even using google was hard here.

The main problem is that the menu system no longer works.  Holding the
mouse cursor above the Applications, Places and System Menues no longer
brings up these items, but the legand for Icons such as opera or
thunderbird, invisible on the screen that seem visually to be under
them. Clicking these items also has the wrong effect. Ie none of the
menues even work. I tried eliminating applets from the bar but although
this looked promising it didnt help me.

In the end I had to restart the xserver, which really I did not want to
do.

I think that this is more fundamental than just changing the layout a
bit. whats needed here is a) The menus still need to work, and they do
not at the moment. b) If you are able to get an app running such as the
one to change the resolution, the desktop should run it, however ugly ,
in a way such that it can be used. There are many apps and some will be
badly designed. The desktop needs to be more forgiving of this poor
design in some way. Perhaps reflecting the bit that is off the bottom of
the screen in a kind of transparent way over the bit that is already on
the screen.  Or allowing the small screen to pan in some kind of drunken
way. Makes me seasick just to think of it.

I enclose a screenshot of what my shrunken screen looked like:


** Attachment added: "Screenshot-Desktop.png"
   http://launchpadlibrarian.net/14377814/Screenshot-Desktop.png

-- 
Quite hard to change screen resolution back to normal when resolution is set 
very low
https://bugs.launchpad.net/bugs/224229
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