By default, your groups of tab will play from beginning to end, then repeat. But you can set custom playback regions to practice one section at a time.
To loop part of a song, just tap the frame you’d like playback to begin at, then tap where you’d like it to end. Playback will now loop just that specific section.
To start playback at a specific point, tap that frame, then tap play. With a single frame selected, playback will begin there, then loop back around to start from the beginning.
To clear the selected region, tap anywhere inside the selection.