AllowReverseGroupClose is an option for Cell that specifies whether a cell group can be reverse closed.

Large is a style or option setting that specifies that objects should be large.

It is perhaps easiest to see when to use certain layout elements by visually illustrating how they each combine to create a resizable dialog. Here are a number of further ...

This example illustrates how to use modal dialogs initiated from another window, optionally setting up property values on widgets in the modal dialog, and, when the modal ...

Merge Cells combines selected cells into one cell.

Wrap at Window Width wraps lines at the width of the window containing the text.

WindowSize is a notebook option that specifies the size of window that should be used to display a notebook on the screen.

WidgetAlign[] is a widget layout placeholder that provides an alignment marker. WidgetAlign[{ref, After}, Before] makes a specific request for the next widget to align to ...

CellTags is an option for Cell that gives a list of tags to associate with a cell.

The Structure of Graphics Two-Dimensional Graphics Elements Graphics Directives and Options