You can modify more than one layer at a time. In the Layer Properties Manager dialog box (click Layers on the Object Properties toolbar) right-click and choose Select All or Clear All. Choose a range of layers by clicking the first layer, holding down Shift and clicking the last in the range. Choose multiple individual layers by pressing Ctrl as you choose each additional layer. Changes to color, linetype, or lineweight affect all the selected layers. And don’t forget that you can sort the listing by any column. For example, if you want to change all your red layers to magenta, click the word “Color” at the top of the Color column to sort all your layers by color. You can now easily select all the red layers to change their color.