This is the widget that will show the user the slideshow, here you can alter the appearance of the widget and how the slideshow UI looks.

You can find the widget under:

BeforeAndAfterCamera → UI → Widget_Slideshow

When you open this file, you will not see the controls, so go to “Animations” at the bottom left and click on “ControlBoxFade”

Then on the timeline change this value from 0.00 to 0.40

Then the control box should appear

Before

After

You may now alter the UI how you like by choosing widgets from the hierarchy and altering their properties (Such as clicking on BtnPreviousPic and changing its colour).