Sorry for late reply: Touch and hold the home button until all running apps/pages are vertically listed and then swipe the page/apps to be closed either to the right or left.
EDIT: The default launcher in your phone is not able to delete unwanted screens.
1. Go to google play store
2. Type 'Nova launcher' in the search bar.
3. Download and install Nova launcher.
4. Navigate to Settings > Home screen and select Nova launcher.
5. To remove/delete unwanted screens go to home page, Touch and hold in an empty space until all the screens are horizontally listed, touch and hold the screen to be removed and slide it to recycle bin on top.