Control the Transparency of Objects
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You can control the transparency level of objects and layers.

Set the transparency level of selected objects or layers to enhance drawings or reduce the visibility of areas that are included for reference only.

Transparency can be set to ByLayer, ByBlock, or to a specific value.

no transparent objects

selected objects 75% transparent

ImportantFor perfomance reasons, plotting transparency is disabled by default. To plot transparent objects, check the Plot Transparency option in either the Plot dialog box or the Page Setup dialog box.
To control the transparency level of objects
Quick Reference
System Variables