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. Mouse pointer as hand If you place the cursor on the box it changes to a hand symbol. You can now drag the box to change the amount of rounding. An outline shows a preview of the result.
ここで表示される枠にカーソルを重ねると、ポインタが手の形に変化します。この状態で枠をドラッグすると、角の丸みの大きさを調整できます。最終的にどのような形状になるかは、アウトラインで表示されます。