Changing virtual desktop size

[Try KDE]

This is probably a X window question, rather than KDE. Question:
During installing Redhat 7.3 and KDE 3.0,  I chose the  resolution as 
1024*768.  After installation, I decided to switch to 800*600. I don't 
know how to do it in any GUI tools, so I directly changed 
/etc/X11/XF86Config-4 in its "Display" subsection.  Now the problem is , 
when I enter KDE again (by startx), the virtual desktop size is still 
1024*768, which causes me  have to move the cursor beyond screen 
boundary in order to see the whole desktop. I know some people might 
appreciate this feature, but i'd rather to change it 800*600.  Any 
suggestions?

Thanks,
-tk.


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