In this video (3, 2, 1, Photoshop! Three Reasons to use Libraries in Photoshop), you’ll discover three ways to improve your workflow using the Libraries panel in Photoshop!
Photoshop 2020 (v21) added three new panels for organizing and applying Gradients, Patterns, and Shapes, and updated the Swatches and Styles panels. Presets can be applied by clicking on the preset in the panel, dragging and dropping the preset from the panel onto the desired layer in the Layer’s panel and/or dragging and dropping the preset from the panel onto the layer content in the canvas area.The contents of the layer (bitmap, vector, type etc.) will determine how the preset is applied: as a property of the layer, as an adjustment layer or, as a Layer Style/Effect.
If you have ever tried selecting a new foreground color using the eyedropper tool only to have the background color updated, make sure that in the Color panel you have the foreground color swatch selected.