When Single Click mode in active, Collection's items can be launched by a single click (like Dock items). To set a Collection in Single Click mode, click Collection's menu and select Single Click:
In Single Click mode a Collection behaves similar to macOS Dock. When Single click mode is on, you can select items in one of the ways: - click the item's label, - keep Shift button pressed while clicking on the item, - select the item by drag, - press Cmd+A to select all items,