Some options:
1)Do not assign the key figure to planning book / data view at all.
2)Set the row to be hidden in data view design in /sapapo/sdp8b (not planning book design).
3)Use macro function row_visible in default macro.
4)Set the row to be hidden in user setting.
5)Use key figure selection functionality.
Please refer to note for more information.
Best Regards,
Ada