Click Insert in the menu bar, and then click the shape of the toolbar.

Then find the corresponding shape in the shape and draw it with the left mouse button.

Draw a flow, then draw a line, click the shape of the toolbar to find the right bracket inside, and then press and hold the left mouse button to draw it.

After drawing a line, you can add an arrow, click the drawing tool in the menu bar, click the outline of the toolbar, and then click the arrow style to add an arrow.

Finally, after drawing, select them all and then combine them.