As explained under 1 Nephi 8:13, Joseph Smith tended to dictate around about in place of the correct round about. Yet in three places, the earliest textual sources support around about, including here in Ether 9:35 where Oliver Cowdery consciously corrected around to round later on (by supralinear insertion and with heavier ink flow). Since either reading is theoretically possible, the critical text will accept around about here in Ether 9:35.
Summary: Restore in Ether 9:35 the original instance of around about; this phraseology, here found originally in 𝓞, was later edited in 𝓞 to round about.