To edit an implemented feature, we can right-click (or left-click) on it on the design tree and select the Edit Feature option. In this case, we want to edit the boss extrude feature we applied. Thus, we can right-click on the first Boss- Extrude feature and select Edit Feature, as shown in the following screenshot:

Once we select Edit Feature, the extruded boss features will be shown on the left, while a preview of the extruded boss feature will be shown on the right. Note that the preview doesn't show the extruded cut feature because it is located lower in the design tree. From the available options, we can change D1 from 50 to 100, as shown in the following screenshot. After making this change, we can click on the green checkmark to implement it:

Now our cylinder will become longer, as shown in the following image. If the shape of the model failed to update, try clicking on the traffic light (Rebuild) icon on top of the SOLIDWORKS interface or using the Ctrl + B shortcut:

This concludes how to edit a feature. Now let's look at deleting a feature.