If the Construction Method you have chosen (in the Dimension Type and Font Panel of Linear Dimension Tool Settings) is Elevation Dimension, the options change accordingly.
For more information on this function, see Elevation Dimensions.
Most of the settings in this dialog box are identical to those at: Linear Dimension Tool Settings
The following describes the controls which are unique to Elevation Dimension Settings.
Marker Type: Click the pop-up to choose a Marker/Dimension text arrangement for the Elevation Dimension.
Click one of these icons to choose a direction for the Elevation Dimension Marker.
Click one of these icons to choose proportions for the Elevation Dimension Marker.
Click one of these buttons to choose outline or solid Marker.
Choose a Dimension Origin from the pop-up list. The choices are:
•Project Zero
•Sea Level (defined at Options > Project Preferences > Reference Levels)
•A Reference Level (defined at Options > Project Preferences > Reference Levels)
•Current User Origin: this option only appears for selected Elevation Dimension chains and indicates that the User Origin has been changed since the dimension chain was placed and the dimension chain has not been updated.
Elevation Dimension Format
[1.25] Click this button to display an indicator (-) only with negative Dimension values.
[+ 1.25] Click this button to display an indicator (- or +) with all Dimension values.