1. Adjust the position of the tracking board of the edge banding machine. The position of the tracking plate of some edge banding machines can be adjusted to adapt to different lengths of workpieces. If your edge banding machine can adjust the position of the tracking board, you can try to move the tracking board to the position of the long board and trim it.

2. Use hand tools for trimming. If the edge banding machine can't trim the long board, you can trim the long board with hand tools, such as manual edge banding machine.

3. Trim manually. If none of the above methods can solve the problem, you can consider using manual pruning. Please note that manual trimming requires certain skills and experience, otherwise the edge sealing quality may be affected.