This is the Quad setup with the 'Commercial' levers, for a 4-engine jet or turboprop. Slot one is now for the speed brake and slot six has flaps movement in a range from 0° to 40° down, marked as 1°, 2°, 5°, 10°, 15° etc.
The Flaps up/down switch is hidden in the pic by throttles 3 & 4. For the Concorde it is used for the droop snoot function.
You can see how the levers are stepped so that they nest together. Throttle lever 1 has a TOGA button on the left.. So, if you just want to set up for a twin, remove levers 2 and 4 and bring throttle 1 across to slot three, to nest with throttle 3. This means you now have throttles marked 1 and 3, but the knob of the throttle 3 lever can be rotated 180° to change the number to 2. Clever stuff
The reverse thrust levers move first to a detent position which lets you move the main levers back, to draw off power. When the main levers reach their flight detent position, the small levers click over their first detent and you can then pull the main levers through their detent.