You can specify visibility and navigation Settings to determine whether the rectangle is always visible or visible only through toggle items.
可以指定可见性和导航设置，以确定矩形是始终可见还是仅通过切换项可见。
The first step is to draw a large rectangle with the default settings.
第一步是用默认设置画一个大四方形，然后保存一下状态。
The first step is to draw a large rectangle with the default settings.
第一步是用默认设置画一个大四方形，然后保存一下状态。
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