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When you use Layer Previous, it undoes the most recent layer change or set
of changes made. Every change you make to layer settings is tracked and can
be undone with Layer Previous. You can use LAYERPMODE to suspend layer
property tracking when you don't need it, such as when you run large scripts.
There is a modest performance gain in turning off Layer Previous tracking.
Layer Previous does not undo the following changes:
Renamed layers. If you rename a layer and change its properties, Layer
Previous restores the original properties but not the original layer name.
Deleted layers. If you delete or purge a layer, using Layer Previous does
not restore it.
Added layers. If you add a new layer to a drawing, using Layer Previous
does not remove it.
Override Layer Properties in Viewports
You can display objects differently by setting property overrides for color,
linetype, lineweight, transparency, and plot style and apply them to individual
layout viewports.
Using property overrides is an efficient way for displaying objects with different
property settings in individual viewports without changing their ByLayer or
ByBlock properties. For example, objects can be made to display more
prominently by changing their color. Because layer property overrides do not
change the layer's global properties, you can have objects display differently
in various viewports without having to create duplicate geometry or use xrefs
that have different layer settings.
Control the Properties of Objects | 107
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