Modify sections in i2pro

[Tarbeker]

Hello community,
I am new to i2pro. We have uploaded the GPS data ifor the venue into the dash. I do receive the data split into laps correctly. Now I want to split the track into sectors for better analysis.
I can create Sectors in 'track editor'. It shows the button 'generate track' The track is 20km long. The button 'Generate Sections' is inactive - greyed out.
How do I activate the sections for analysing my data?

Is there a tutorial about how the handle sectors in i2pro?