Quran Life gives you two different behaviors when a surah leaves the Complete column.
The first option is to suspend only the mindmap. In that mode, the surah mindmap leaves review, but the existing verse reviews stay active. This makes sense when the structure still needs work but the verse groups themselves are still trustworthy enough to keep reviewing.
The second option is to suspend both the mindmap and the verses. In that mode, taking the surah out of Complete also hides its verse reviews from the active review queue until the surah is restored. This makes sense when you want the structural work and the verse work to stay tightly coupled.
This setting is about honesty without waste. If part of your work is still valid, there is no reason to throw it away. But if the verse review should not continue independently from the mindmap state, Quran Life also lets you enforce that more strict behavior.