Hi @tarek,
Apologies for this – Ewald sphere correction was only formally added to the Homogeneous reconstruction, homogeneous refinement, and CTF refinement jobs (it was a bug that these parameters appear on the non-uniform refinement job, which we will resolve in a patch).
Of course, you may still want to use the two in conjunction. Right now the best way to do that is to run non-uniform refinement without EWS enabled, and then use the output particles (and output FSC mask) as the inputs to a homogeneous reconstruction only job with EWS enabled. This would be similar to the tutorial workflow shown on our guide.
Best,
Michael