Click Connection Beam Settings from the Settings menu. Enter 0.20 for
thickness and 0.60 for height in the appearing Connection Beam Settings dialog. Click
OK to exit.
Move the mouse cursor on the column C4 and click after you see the OK sign.
Move the mouse cursor on the column C4 and make the beam defined from the
middle by pressing the space-bar from the keyboard (you can follow the message
below from the info bar). Left-click after the mouse takes the OK sign.
Move the cursor on the column C5 and left-click. Move the cursor on the column
C6 and left-click.
Click the right mouse button. Bring the mouse cursor on the column C8 and
left-click. Bring the mouse cursor on the column C5 and left-click.
Move the cursor on the column C5 and left-click. Move the cursor on the column
C2 and left-click.