All inverter inputs strings you want to be displayed are activated. Activate or deactivate strings at System level under System configuration > Data sources.
Further details
Rename your inverter inputs at at System level under System configuration > Data sources. Default naming convention is: I_DCx_y (z)
x = MPPT
y = input
z = inverter
By default, only one inverter is selected to be displayed. You can change the selection manually.
Battery inverters are not included in this chart.
Note
Find further information on the general functions within charts under Evaluations & charts.