I import 4:3 pictures into Nero Video. But the pictures always have left and right black bars in the slideshow, How can I change this?

If you don't want black bars, there are solutions：

Solution 1: Open "Options -> Application Setting -> Editing", check "Automatic removal of black bars", then drag pictures into timeline.

Solutuion 2: Open "Options -> Movie options", select "Resolution" as TV Standard 4:3, the quality will be reduced due to the resolution being reduced.

Solution 3. If you don't want to reduce the quality and don't want black bars, select one picture, click express the effect control button "fx" then set "Scale" is "Scale and Fit", the picture will zoom in and fit.