Adding a background mask to a multiline text pethydro.org a Background Mask to Multiline Text You can easily add an opaque background. If you select the Lines Merge option, this will make background text masking and wipeouts not work and the objects under the text mask will be. This command works only for single line text. a mask around text to make the text clear against the background. mask text in AutoCAD. To update the mask after editing the text, run TEXTMASK again, and select the text object with a rectangular frame displayed in the graphics background color . Masking does not plot properly if the Hide Lines option is used while plotting. BUT if you double-click not-masked text first, then one-click on masked - it DOES let you edit the text!!! Really, autocad sometimes works in. Summary: Should be able to apply background mask to Dynamic (single line) text and MText to follow Product and Feature: AutoCAD - Text. Often text objects, such as room labels, overlap actual drawing elements. A Background Mask can be applied to MTEXT objects to mask or hide drawing.