Active Level
Sets the Active Level, the level on which an element is placed, and changes the levels of selected elements. This drop-down list box can also be used to toggle the display of a level in all views and to toggle its lock status.
To toggle the display of a level in all views, it is necessary to click the symbol in the first column of symbols to the right of the level name. A check mark in this column indicates the level is on; a circle indicates the level is off; and a checkerboard indicates a mixed display or on in some views, while off in others.
To toggle a level's lock status, it is necessary to click the symbol in the second column of symbols to the right of the level name. A lock icon in this column indicates the level is locked; a circle indicates the level is unlocked.
The third and last column to the right of the level names shows the level's default color for element placement.
Clicking Filter opens the Recall Level Filter dialog that is used to apply existing filters.