Hmm, well unfortunately I can’t see any particularly straightforward ways to do this. Some possible options you could look into though include:
– Outright replacing the tickets meta box (unregister the existing one and register your own near-duplicate version without the SKU fields), though this is quite involved
– Using some Javascript magic to hide or remove the table row containing both the input and the label
– Hiding the field with CSS … note that the “SKU:” label would currently be quite hard to target though
Sorry we can’t do more. I’m not really confident that hiding the SKU fields is something many people would need, but even so you could definitely make a feature request for this – even just a request that hiding it be made easier – by posting on our UserVoice page:
https://tribe.uservoice.com/forums/195723-feature-ideas
Sorry we can’t do more!