Chart Selection drop down list
At the top left side of the Time Lord List window is the Chart Selection Drop Down list as shown below:
This will allow you to change which chart you want to calculate time lord sequences for. You do not have to have the chart displayed in the main chart viewer, but it helps to have the chart display showing the same chart that you are calculating time lords for because the sequences are interpreted according to the positions of the planets in the chart that are time lords and what planets testify to those places.