Select an asset in the Browse Panel to work with it. Use these techniques to select assets:
A single asset
Click the asset (double-clicking opens the asset in Detail view).
Ctrl+click (Windows) or Command+click (Macintosh) assets to select assets in different places on the Browse Panel. Shift+click (click one asset, and then Shift+click another) to select adjacent assets.
All assets in the Browse Panel
Click Select > All.
Click Select > None.