Design Collections are essentially a collection of Slide Masters that
collectively act as a template
for colours, fonts, images and standard shapes/elements throughout your
presentation. They offer a quick
and easy way to appy consistent branding and themes to achieve consistency
across your slides.
Design Collections are grouped under slideAcross collections (i.e. default
designs that are offered to get you started),
your organisation collections (if your administrator has set these up) and
your personal collections.
Each of these are accessed from the the second block of controls under the
"Design, Layers & AI" tab - this includes a button that brings
up the Presentation Theme and Design selector.
When you select a theme, slideAcross will apply this across all of your
slides. Colours, fonts and layouts will all be affected as
slideAcross seeks to apply the theme in the most accurate way across each
slide in your presentation.