VIs in the FPGA Interface function palette are only available in VIs that are running outside of the FPGA target of a project. To find the VIs in this palette you can:
These also may not show up properly if you do not have the proper software installed. Make sure that you have the Real-Time Module and FPGA Module that are compatible with your version of LabVIEW.
Other problems related to palettes not appearing can be related to:
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