As you can see from the previous section, developing styles is a time-consuming task. But the good thing is that once developed, styles are not lost. They can be saved, applied to other layers, and imported from and exported to external sources.
The main style management options are available from the Style button at the bottom row of the Style section under Properties as shown. The menu is divided into sections separated by horizontal lines. The first section is responsible for loading and saving styles. The second and third are for managing multiple styles for the layer, and at the bottom is the toggle for activating different styles (inactive and grayed out by default, when there's only one style available).