I don’t know if the lever binder you are talking about is one of the following. You can try the following steps:
1. Metal binder: This metal binder is semi-automatic , after flattening the book, press the two circles circled up and down at the same time, and the coil will open.
2. Plastic binder: Plastic coils like this can be separated one by one by hand. The coils are joined together in the middle and can be easily opened by hand.
3. Pull-out binder: Open the plastic coil from the middle to both sides, hold the tail of the plastic coil, pull it out from top to bottom, and the coil can be opened easily.
4. Telescopic clip: The telescopic clip has slots that snap together, but it is soft and can be bent at will and opened at a suitable angle.