Sometimes you access some API so frequently, that having the right object available all the time is a good option. That's why having favorites on top in my VSCode UI5 API Reference Panel extension was a good candidate as a next feature.

Favorites in the panel and configuration

Favorites can be added using the icons in the panel and they are stored in the workspace configuration - so you can also maintain them there.

Available in version >1.3.0.

The extension in VSCode marketplace: link