The buttons in the Drawing toolbar found in the Symbol Editor are described below.

Button Description
Align Left button. Moves selected objects horizontally so that their left sides line up with the left side of the left-most object. At least two objects must be selected to enable this button. Does not apply to pins.
Align Right button. Moves selected objects horizontally so that their right sides line up with the right side of the right-most object. At least two objects must be selected to enable this button. Does not apply to pins.
Align Top button. Moves selected objects vertically so that their top sides line up with the top side of the top-most object. At least two objects must be selected to enable this button. Does not apply to pins.
Align Bottom button. Moves the selected objects vertically so that their bottom sides line up with the bottom side of the bottom-most object. At least two objects must be selected to enable this button. Does not apply to pins.
Snap To Grid button. Snaps the selected element(s) to the Draw Grid that is found within the symbol's boundary box. Does not apply to pins.
Distribute Horizontal button. Evenly spaces the selected objects horizontally. At least three objects must be selected to enable this button. Does not apply to pins.
Distribute Vertical button. Evenly spaces the selected objects vertically. At least three objects must be selected to enable this button. Does not apply to pins.
Bring To Front button. Brings selected element(s) to the foreground on the workspace. Other element(s) appear behind them. Does not apply to pins.
Send To Back button. Sends selected element(s) to the background on the workspace. Other elements appear in front of them. Does not apply to pins.
Rotate 90 Counter CW button. Rotates the selected element(s) 90 degrees counter-clockwise. Does not apply to pins.
Rotate 90 Clockwise button. Rotates the selected element(s) 90 degrees clockwise. Does not apply to pins.
Flip Horizontal button. Flips the selected element(s) horizontally on the workspace. Does not apply to pins.
Flip Vertical button. Flips the selected element(s) vertically on the workspace. Does not apply to pins.
Ungroup button. Returns an element that was made using the Group command back to its individual elements. Does not apply to pins.
Group button. Places selected elements in one group. Does not apply to pins.
Resize Boundary Box button. Places a cursor at the lower-right corner of the boundary box. Drag it to the desired location to resize the boundary box. You cannot make the boundary box smaller than the elements that it contains or smaller than is required for the pins that are attached to it.