Use this procedure if you want to activate a different theme. Regardless of how many display themes you add to your drawing, only one theme at a time can be active. If you add a display theme to a drawing that has existing themes, the other themes are disabled. A disabled display theme is indicated by a marker through the legend.
If you attach or overlay a drawing as an external reference (xref) in a project, all display themes in the xref are imported into the host drawing by default. If the host drawing has existing display themes, then the active display theme in the host drawing overrides any active display theme in the xref.
- Select a disabled display theme legend.
- Click
. 
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The marker is removed from the selected legend and applied to any others in the drawing.
Active display theme legend