9.2 Leaders & Multileaders

A leader is a line — straight or curved — that connects an annotation to a specific point on a drawing. AutoCAD has two generations of leader tools: the legacy LEADER and QLEADER commands, and the modern, style-driven MLEADER (multileader) command that has been the primary annotation tool since text and dimensions moved to style-based objects. The ACU AutoCAD exam focuses on MLEADER and its supporting commands, so this section covers multileader anatomy, creation, editing, and styling in depth.

Anatomy of a Multileader

Every multileader object is built from up to four parts:

• Arrowhead — marks the exact point being called out
• Leader line(s) — straight segments or a spline curve running from the arrowhead toward the content
• Landing — a short horizontal segment placed just before the content, giving the annotation a clean visual anchor
• Content — an mtext paragraph, an inserted block (commonly a GD&T feature control frame or datum symbol), or no content at all

Creating a Multileader

By default, MLEADER asks you to pick the arrowhead location first, then the landing location, and finally opens the in-place mtext editor for typing the content — the same editor used by the MTEXT command. Before picking the first point, the command line also offers several options:

• leader Landing — toggles whether this multileader includes a landing segment at all
• Content type — overrides the style's default content type (Mtext, Block, or None) for this one instance
• Maxpoints — sets the maximum number of vertices allowed along the leader line's path before the content point is picked, enabling a leader with a bent, multi-segment route rather than a single straight or curved shot
• First angle / Second angle — constrains the first and second leader segments to specific angle increments, which is how a leader gets a forced horizontal or vertical dogleg near the landing
• Options — lets you change the creation order itself (leader first, content first, or an options-first sequence)

Multiple Arrows, One Annotation

MLEADEREDIT offers Add leader and Remove leader sub-options that let a single existing multileader — with one content block or mtext paragraph — gain or lose additional arrow branches pointing at other locations in the drawing. This means one callout note, such as "TYP" or a single feature control frame, can point at several identical features simultaneously, or an unwanted branch can be trimmed away, all without creating a brand-new multileader object for every occurrence.

Aligning a Row of Multileaders

MLEADERALIGN takes two or more already-placed multileader objects, plus a reference multileader or a specified direction, and repositions their landings into a straight, evenly (or manually) spaced row. Each multileader's arrow stays anchored to its original feature point — only the landing and content shift into alignment — which is exactly the cleanup needed after several callouts were drawn separately and now sit at inconsistent heights or spacing.

Collecting Block Content onto One Landing

MLEADERCOLLECT applies specifically to multileaders whose content is a block, not mtext. It gathers several individual block-content multileaders — most commonly stacked GD&T feature control frames or datum identifiers that currently sit on separate landings — and merges them onto a single shared landing line, arranged either stacked vertically or side by side. This matches standard drafting convention where multiple GD&T frames referencing the same feature are grouped under one leader rather than drawn as several redundant arrows.

MLEADERSTYLE: Three Tabs, Every Default

The Multileader Style dialog, opened with MLEADERSTYLE, organizes every default setting into three tabs:

Leader Connection: Horizontal Attachment

When mtext content sits beside a multi-line leader, the Leader Connection setting decides which line of that paragraph the landing lines up with:

Left-side attachment and right-side attachment are configured independently, since content can be placed on either side of the arrow depending on where the leader was drawn.

Editing an Existing Multileader

Grips appear at the arrowhead tip, at landing or vertex points along the leader path, and at the content's insertion location. Dragging the content grip relocates the text or block and automatically redraws the intervening leader segments to keep the arrow anchored at its original point; dragging the arrowhead grip alone moves only the point being indicated. Double-clicking the mtext content opens the same in-place editor used everywhere else in AutoCAD. The Properties palette also lets you reassign the multileader style, or override the arrowhead symbol, arrowhead size, landing gap, or leader type on a single object without touching the style definition itself.

Legacy Leader Commands

LEADER (command-line only, no style attached, deprecated but still functional) and QLEADER (adds a settings dialog whose three tabs mirror today's multileader style) both predate the style-driven multileader object. A drawing opened from an older release may still contain leaders built with these commands — recognize that they are a genuinely different object type from a MULTILEADER and do not carry a Multileader Style property at all.

On the Exam

Expect scenario questions that describe a symptom — several separately drawn callouts with inconsistent landing heights, or stacked GD&T frames cluttering a view — and ask which command fixes it (MLEADERALIGN versus MLEADERCOLLECT versus MLEADEREDIT's Add leader). The three MLEADERSTYLE tabs and the leader connection attachment table are also common direct-recall items.