# Wallpaper Engine window is transparent

If your Wallpaper Engine user interface is see-through, you have likely accidentally used the slider at the bottom of the window to reduce its opacity. Simply drag it to the right to revert the opacity again:

Use the slider at the bottom of the user interface to control the opacity

TIP

You can use the slider to peek at wallpapers while configuring or browsing them without having to move the Wallpaper Engine window.