In Quran Life, the surah mindmap and the verse groups are closely connected. The mindmap gives the structure of the surah, and the verse groups turn that structure into pieces you can actually review.
So when you choose where the surah should be split, you are also deciding how that surah will be carried in review.
That is why the app treats those edits carefully. Once you define the verse groups, those become the groups review will follow.
When you edit the verse groups, Quran Life updates review to match them.
The important part is that this is not treated like a full wipe every time. Quran Life tries to affect only the verse groups that really changed. Unchanged groups keep their progress, while changed ones are updated or reset to match the new structure.
So the practical idea is simple: the surah mindmap gives the route, the verse groups break that route into reviewable pieces, and when you edit those pieces Quran Life tries to preserve what is still valid while resetting what no longer matches.