Autodesk 15606-011408-9330 User Guide - Page 166

The settings you specify for this particular style determine how all features on the layer are drawn. However, on polyline layers, you can add additional display styles if you want to overlap display styles to create the effect of complex line styles. For more information, see "Creating Complex Line Styles with Polylines" on page 170. This button is enabled for text and point layers only. When themes are enabled, there is a separate entry in the Styles list for each theme category. You specify settings for each theme category separately. For more information, see "Setting Display Styles for DWG Layers" on page 171. Specifying Size Units for Text and Point Layers Help Index size units for text and point layers With text and point layers, you can specify whether to use screen units (inches or centimeters) or mapping coordinate system units to express the width and height of features in the map. To specify size units, you click the Size Units button in the Styles tab of the Map Layer Properties dialog box.  For step-by-step instructions, choose Help Contents, click the Index tab, and look up "size units, for text and point layers." 166 | Chapter 9 Working with Map Layers