MultiLeader
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MultiLeader have different properties than standard dimensions.
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The feature of the MultiLeader Properties Content page vary depending upon the content type specified in the selected MultiLeader Style. If the Content Type in the style is set to none the page will be blank. If the Content Type is set to text the page will be as follows: 
Text Style: Set which Text style from the Style manager is used in the multileader.
Height: Sets the height of the text. This will override the settings in the styles.
Frame around text: specifies whether a box will be drawn around the text of the multileader.
Width: Sets the width of the paragraph.
Background Mask: Creates a mask for objects behind the text.
Color: Sets the text color.
Justify: Specifies the text justification.
Left Attachment: Specifies the vertical position where the leaders on the left side of the content.
Right Attachment: Specifies the vertical position where the leaders on the right side of the content.
Text Rotation: Specifies the angle of the content text.
Landing Gap: Specifies the distance between the end of the landing and the content.
Style: Select At Least to automatically set the line size relative to the largest character of a line. Select Exactly to keep all lines the same size.
Factor: Sets the distance between lines. If the Content Type in the style is set to block the Content page will look as follows: 
Block Source: Specifies the block to be used in the content.
Block Attachment: Specifies whether the block will be attached to the multileader using its geometric center of the block, or attached using the block reference point (insertion point).
Block Color: Sets the block color.
Block Rotation: specifies the angle for the rotation of the block insertion.
Scale X: Sets a scaling factor for the block along its X axis.
Scale Y: Sets a scaling factor for the block along its Y axis.
Scale Z: Sets a scaling factor for the block along its Z axis.