The Asset Browser is used to browse the game assets file tree.
To access the Asset Browser, activate it from the main menu of the World Editor by selecting Tools > Asset Browser.
You can create certain type of assets using the Create menu.
Favorite folders can be defined using the star button in the Asset Browser toolbar.
You can also filter which asset types are visible in the file list, using the filter popup from the Asset Browser toolbar (right to the star button icon).
Meshes (TSStatic class) instances can be created by dragging the Collada DAE asset into the viewport. See more about Creating objects.