In Word, how do I convert all endnotes from i, ii, iii to 1, 2, 3?

I half-converted to Macs three years ago, but continued to use a PC desktop until a year ago; and on the PC, the Word default of numbering endnotes with small Roman numerals (i, ii, iii) was easy to fix, so I continued running that fix on the PC. Now I no longer have that crutch, and I've been searching all over my MacBook Pro to find a way to do it, and failing. Obviously I can do it manually: do a cut-and-paste, recreating each endnote with the proper numbering system. But I really want to LEARN how to it right!