How to Re-Enable a Spawner You Previously Disabled
Break One Torch
The mod's effect is not permanent. A spawner is disabled only while it is surrounded by the required torches. To turn it back on, break any single torch from the surrounding ring. As soon as the spawner is no longer fully surrounded, it returns to normal spawning behavior.
Check for Leftover Torches
If the spawner still seems inactive after you break a torch, look for other torches you may have placed around it. It is easy to forget an extra torch on top or on a side block. Remove torches until fewer than the required number remain adjacent to the spawner.
Plan Before You Re-Enable
Think about why you disabled it in the first place. If you want to farm the mobs, re-enabling is useful — but you will need a proper trap or killing area, since the spawner will start producing mobs again immediately when a player is in range. If you only wanted the spawner off temporarily to pass through safely, consider leaving the torches in place and breaking them only when you are ready to build a farm around it.