Formatting a Shape
Your arrow should look something like this:
By default, shapes are filled with a color associated with the chosen theme. This example uses the Material theme. Dark gray is one of the accent colors within this theme. This color can easily be changed.
Let's change the color of this arrow. When formatting a shape, the shape must be selected. You can tell if the arrow is selected because it will have a border and sizing handles.
The Fill color options appear:
The arrow changes color. However, there is still a dark border around the shape. This border can also be modified. We can change the color or weight of the line.
The border has changed.
Note: If you don't want a visible border on your shape, you could make the border transparent.
Note: It is also possible to utilize a border, but make the inside of a shape transparent. This is a good way to use a shape to circle items on your slide.