With the Allocations layer enabled, click 'Reorder layers' located at the top right corner to open the menu.
In the menu, click the eye icon next to 'Allocations' to hide this layer on the map.
On the map, click on the site you wish to view. The site information will be displayed in the left sidebar, and the selected site will be highlighted in purple on the map.
To show the Allocations layer again, simply click the eye icon in the 'Reorder layers' menu.