Slider is not fullwidth anymore

If you created a fullwidth slider in some previous versions and after the update, your slider is not fullwidth anymore, the problem will be that at the General tab -> Align your slider is not aligned to normal (which is the default setting) but to some other side, so just set it back to normal and it will solve the problem.

Using the fullwidth slider type the alignment won't really matter anyway, because the slider will scale up to fill your screen, no matter which alignment you set.