/etc/libreoffice/sofficerc is in libreoffice-common 1:3.5.2-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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HideEula=1
Logo=1
NativeProgress=true
ProgressBarColor=221,72,20
ProgressFrameColor=207,208,211
ProgressPosition=164,225
ProgressSize=319,10
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