How do you change the slide layout?
select a new layout from the slide pane.
select a new layout from the task pane.
select new layout from the edit menu.
select new layout from the tools menu.
which one?

The answer is "Select New layout from the Tools menu"

Explanation:

In PowerPoint, Slide is a page, that includes text, images, audio, and video. To change the slide view in a Home tab, there are many sub-tab, in which a menu tool provides a layout tab, that changes slide layout. and other options are not correct, that can be described as follows:

In option first, The slide pane option available PowerPoint 2016 which provides a list of all slides on the left side of the screen that's why it does not use in slide layout. In option second, The Task pane selects one or more pages on the slide that is divided into sections that's why it is not correct. In option Third, The edit menu is used to change the size, text color and adjust the size of shapes that's why it is not used in slide layout.