Bands metadata is added to the Query Builder interface panel.  By hovering your cursor over the icon with the band number you can obtain data on color (red, nir, swir, etc.), wavelength and resolution.
What’s more, to make the selection of the required band set* as simple as possible, there is a preset displaying of active bands based on API metadata.  If there is no metadata available for the selected date or territory for one or another band, they become inactive (the icons turn grey).

* It’s not possible to alter the band set selection for truecolor, falsecolor and ndvi presets.  For these, the band sets come pre-installed.