Hello Elizabeth,
For the Kinetis family it is recommended to leave unused pines floating and configure them as disabled.
In the below document you can find some tips and tricks to consider when designing for low power.
https://developer.mbed.org/media/uploads/GregC/an4470-using_low-power_modes_with_kinetis_mcus.pdf
I hope this helps,
Have a great day,
Sol
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------
