The frame indicates the amount by which the corners are rounded. When the frame is positioned at the top left corner, no rounding occurs. When the frame is positioned on the handle centred at the top of the object, the corners are rounded as much as possible. You adjust the degree of rounding by moving the frame between these two positions.
图标时，会在对象的左上角显示一个小框。该框指明了各个角被圆化的程度。当框位于左上角时，表示未发生圆化。当框位于对象顶部中心处的控点上时，表示角被最大限度地圆化。通过在这两个位置之间移动框，可以调整角的圆化程度。