Select Rectangular Box Selection Tool, place the mouse cursor over the selection, click the right mouse button to open the shortcut menu, and then select Transform Selection. At this time, a border will appear in the selection, and a tool options bar similar to the mobile tool will appear above it, except that the small icon in front is used to adjust the selection. Select the selection control point and drag it to the left to narrow the selection. . You can also perform various transformation operations, put the mouse cursor on the selection, click the right mouse button to open the shortcut menu, and select' Deformation'. . Click and drag a control point to change the selected shape.