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The on_start. lisp file is used here at startup (as the renamed startup file originally used with a competing software). What would a line of code look like that would lock the UCS Icon at the 2D view origin?
In settings search for ucsicon and find two bitsum values:
1 for show icon and
2 for origin
So if you want to have a UCS icon always shown and if possible at the origin, you want value 1 + 2 = 3.
1 + 2 = 3
You'll also find ucsiconpos for left, right positions and other valuable settings.
In its most basic form, the following line should do:
(setvar 'ucsicon 3)
You may want to consider creating on_doc_load.lsp and put it there. Location in search path and best not in "program files" locations in order to survive an update of BricsCAD.
This is exactly the information I needed.