I wanted to unset printing everything. For that, I started of my attempt to only unset printing notation but somehow it’s not working as I expected. e.g.
Not sure what could work in your case, missing some context from your example.
But if you want Coq to give you the most information you can try Set Printing All.
Sorry this does not work (even with the right syntax Eval cbv delta in t.) because Lemmas are generally stored as opaque constants, therefore you can print them, but not unfold them in another term.