Print tab will change depending if the printer is printing or not.
When the printer is idling it will have an option to select print => print file
or it will have an option to run MACRO command. It is handy when you need to reset bltcouh for instance
Once it is printing you will have access to the status of the print and the parameter window where you can make adjustments to the print parameters. From this screen you can also microstep the nozzle up and down when the print is starting. This allows fine tuning of the gap between the nozzle and the plate for the first layer.
You can also pause and resume the print from this menu