In the Build Raster Stack dialog, you can import individual bands from files using the Spectral Subset, then move them into position in this dialog.

https://www.l3harrisgeospatial.com/docs/buildbandstacks.html
"Drag and drop the items in the Input Rasters field to the desired order in the band stack."

If you import a multiband file rather than the individual bands, the file will be treated as one entry and you can move the entire file above or below other bands. But it is up to the user to place the bands in the desired order.

Thanks, I tried that with mixed results. However, the issues was resolved once I updated to version 5.6.2.