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In Gnome under "Places" you will find the 10 (or so) last Documents that have been opened/used. There might be many good reasons to remove this list or to reduce or increase the number of "last Documents". Here is how it is done in Gnome:
As you can see you can adjust "5" to whatever you need.
This will only affect Gnome not OpenOffice
Manjaro 64bit on the main box -Intel(R) Core(TM) i7 CPU 920 @ 2.67GHz and nVidia Corporation GT200b [GeForce GTX 275] (rev a1. + Centos on the server - Arch on the laptop. "There are no stupid questions - Only stupid answers!"