A sidelite is a glass panel set on one or both sides of a window. A highlite is a glass panel above a window. A lowlite is a glass panel below a window. You can create a custom configuration of sidelites, highlites and lowlites for a window.
To edit a window’s lites:
Select the window whose properties you want to change.
Right-click and select Properties, or select Edit > Modify Elements > Properties.
In the Windows dialog, select the Lites tab.
In the Type area select the lite you want to specify settings for. Note that the lite must be enabled on the Basic page before you can edit it.
To select a specific window type for the currently selected lite, click on the appropriate graphic in the Type area.
Edit the dimensions of the lite in the Properties area if desired. Clicking a dimension marked with an alphabetical character (a, b, c, etc.) highlights the corresponding dimension in the sidelite/highlite graphic, and vice versa.
Click OK.