Welcome to crew mate.
This is intended for British Airways long haul crew as a guide to your working positions on the full worldwide fleet.
You can click on a position to grey it out when you are breifing. A second click will bring it back if a chenge is made. There is also a reset button to reset all greyed out selections.
All the positions are displayed in the correct area of the aircraft, with first & second break colour coded and d/f position marked.
The different positions are coloured (text) for the different cabins too.
Happy flying.