Go to setting by tapping the cog in the top right corner of the screen while in the main view of your recorded tracks. From the settings menu, go to Sections and you can make sections for your song to easily distinguish between different "sections" of your song. These sections' lengths can be edited with the blue arrow next to the Section A tab, and you can add more by clicking Add at the bottom right after scrolling down.
I STRONGLY RECOMMEND NOT USING SECTIONS because once you make a section and set its length, and then fill it up with one or more recordings or tracks, if you change the length forward or backward, it will cut off the following or previous sections. Basically, it's set in stone (unless you want to lose some of your recordings) once you set the length. I just make Section A 150 bars and lengthen it once I fill that part of it up.
Hope this helps! 🙂