The manpage for vi(1) has a small error for the :Visual/:visual command. The 'V' can be capital or lowercase, followed by an 'i' and optionally 'sual'. But the manpage shows the command as [Vi]i[sual] instead of [Vv]i[sual].
The usage text in vi confirms the correct syntax (as does the roff documentation). usr.bin/vi/ex/ex_cmd.c - line 386: /* C_VISUAL_VI */ {"visual", ex_edit, E_NEWSCREEN, "f1o", "[Vv]i[sual][!] [+cmd] [file]", "edit another file (from vi mode only)"}, Tim. Index: docs/USD.doc/vi.man/vi.1 =================================================================== RCS file: /cvs/src/usr.bin/vi/docs/USD.doc/vi.man/vi.1,v retrieving revision 1.74 diff -u -p -r1.74 vi.1 --- docs/USD.doc/vi.man/vi.1 22 Aug 2017 20:27:18 -0000 1.74 +++ docs/USD.doc/vi.man/vi.1 3 Feb 2018 02:02:38 -0000 @@ -2200,7 +2200,7 @@ Enter .Nm vi . .Pp .It Xo -.Op Cm Vi Ns +.Op Cm Vv Ns .Cm i Ns Op Cm sual Ns .Op Cm !\& .Op Ar +cmd