Change Connector Type
There are essentially three types of connectors that you can use to link shapes in PowerPoint 2013 -- also you can add any of these three connectors (Straight, Elbow, or Curved) as per your requirements. However, what will you do if you added a connector of one type and later realize that you should have used a different type? You need not delete the existing connector and draw another one because PowerPoint 2013 allows you to change from one connector type to another fairly easily.

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Fill and Line Options for the Chart Area
When you create charts within PowerPoint, typically the Chart Area doesn't show any fill or any kind of formatting. The exception to this rule is if you have applied a particular Chart Style. Thus in most scenarios, the Chart Area is completely transparent with no fill or outline attributes. This default status works well most of the time since the Chart Area is just the area above which all chart elements are placed. However, if your slide background is crowded, then the Chart Area's transparency can pose a problem. To counter this issue, you can fill the Chart Area with a solid color, a gradient or even a pattern to add some visual separation from the slide's background.

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Formatting Connectors
Connectors may be different than lines in some ways because they are linked to the shapes they connect -- move the linked shape, and the connector repositions itself with the shape. Yet in other ways, connectors are just like conventional lines in PowerPoint, especially when you explore their formatting options. You can thus add arrowheads to your connectors (or remove them), make your connector a dashed line rather than an undashed one, and also change the thickness of the connector.

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Effect Options for the Chart Area
There are plenty of ways to make the Chart Area stand out on your slide. One method is to use the Fill and Line options to apply a fill and/or a border to the Chart Area. Additionally you can also apply any of the Effects that PowerPoint 2013 provides. Follow these steps to learn about the various Effects that can be applied to the Chart Area.

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Change Connector Color
There's more to connectors than just drawing them to link shapes in PowerPoint 2013. You can format their line thickness, dash attributes, etc. In many ways, connectors are just like conventional lines in PowerPoint, especially where their formatting options are concerned -- so changing the color attributes of a connector is almost like changing the color of any line.