Styles are predesigned sets of effects, fills, colours and other properties that can be instantly applied to objects. They are managed on the Styles panel.
Your Affinity app can import compatible styles files with an .afstyles file extension.
To import styles:
Select the Styles panel.
From the Panel Preferences menu, select Import Styles.
From the Panel Preferences menu, select Import Styles Category.
Browse to and select the .afstyles file you want to import.
Click Open.
After importing
A new category containing the styles is automatically displayed on the Styles panel.