Extend Length of SlideShow Photos

I want to extend the length of each photo in a slide show to 8 seconds. I am only able to do this one photo at a time. Is it possible in Davinci Resolve 15(Free Version) to have all of the photos set to 8 seconds rather than having to do each one separately?

[Dwaine Maggart]

Resolve Preferences:

Thank you. It works.