The settings checkbox "Allow span, load input in ft.in.16ths" has been moved from the Preferences settings to the Format settings, as it is related to unit formatting.
See Also
Settings
Apply Settings to Concept Mode (Change 49)
Separate Settings for Individual Open Files (Change 49)
Warning message on Save as Default and Restore Factory Settings (Change 47)
Save to File Note in Settings Input (Change 58)
Order of Beam and Column Mode Preference Settings (Change 52)
Restore Factory Settings for Column Self-weight (Bug 2093)
Tool Tip for Settings in Toolbar (Bug 2050)