US Letter Paper Size Not on List of Sizes

I'd like to print a drawing on US Letter size paper.  It is a small drawing and will fit on that size and that is a paper size commonly available to me.  I can't find it on the list.  I also don't see a way to add a custom paper size.

I'm using Linux Mint 18.2, here is the info on my LibreCAD:

LibreCAD
Version: master
SCM Revision: 2.0.9
Compiler: GNU GCC 5.3.1
Qt Version: 5.5.1
Compiled on: Mar 24 2016

I'm assuming this got lost somewhere along the line.  How do I add it?

'Letter' ( 8 1/2 x 11") is normally on the list.  It needs to be specified for the drawing (From the menu select Options -> Current Drawing Preferenes - > Paper tab).  "Letter" is second on the list.  A custom paper size can also be defined on the tab.

Regards....

Thanks,

I found it.  It is a long list and unless I scroll up I don't see the beginning of the list. It starts at A0 which looks like the start of an alphabetized list. Even scrolling up took a couple tries before I got all the way to the top. I'm using a laptop with a screen with an aspect ratio where the screen is quite a bit wider that the height.  Maybe that has something to do with it.