Hello,
The Slider that comes with the Electronics Demo is built differently under the Slider Revolution and your current is built differently. You current Slider seems to have Images with our lower dimension which is why they aren’t covering up the whole area and left some space.
Moreover, if you want to use the simple Slider on your Site then we would suggest you to use the default WoodMart Slides which you can find under the Dashboard > Slides and can import under the Dashboard > WoodMart > Prebuilt websites > Additional Pages > there import Sliders: https://snipboard.io/zA0Mn5.jpg
Best Regards