fel0ncod3, Welcome to PinStack.
Apparently you downloaded one of the custom theme that use transparent or very translucient Icons. This is done on purpose so that the Background image is not obscured. The reason that the Show All is not available is that you haven't hidden any Icons yet.
If you don't like the invisible Icon theme try loading another making sure the sample image provided shows the Icons on the Home screen or the description states Full Icons and not Transparent Icons.
Personally, I use the Transparent Icon themes exclusively. If you keep the Icons in the same location all the time you'll soon get used to going to them without problem, just by location.
Hope This Helps.