We esteemed Joseph our leader. He truly was our leader in one sense,—the leader that we conversed with face to face, but he was not our invisible Leader, for that Leader was and is the Lord Jehovah. (A Series of Instructions and Remarks by President Brigham Young at a Special Council, Tabernacle, March 21, 1858 [Salt Lake City: n.p., 1858], 1; cf. D&C 28:6)
Notice also how Brigham calls the Lord "our invisible Leader," showing that LDS theology has no issue with God being "invisible." On God being "invisible," see:
Andrew Malone on God being "Invisible" and 1 Timothy 1:17 and 6:16
