According to OPS 1.970 a pilot should carry out 3 take-offs and 3 landings in the previous 90 days as pilot flying in an aeroplane, or in a flight simulator of the same type/class.
IMPORTANT INFORMATION !
An example below will explain how this feature works.
Crew TAR has carried 3 take-offs and 3 landings in previous 90 days on 2 types of aircraft.
Go to Crew > Duties section - right next to pilot's code there is a status-dot. Hover the mouse over the dot to get the information displayed in the pop-up window. In case of crew TAR it shows, that 51 days left to expire '90 days currency' for aircraft G450 and 81 days for aircraft H750 - here is how it was calculated:
If a pilot has not carried 3 take-offs and landings within 90 days, when hovering the mouse over the status-dot, the information will be displayed as '0' days left. If the number between the latest take-off/landing and the current date (date of checking) is lower than 30 - the dot will become orange. The same applies to night landing status.