In this excerpt from Page 55 of the Dealer's Manual (DM-GN0001) for Sora R3000, the groupset on the Giant Contend 1,
 and (w). It also has two intermediate _trim_ positions (x) and (y).
The (x) position can only be reached from (v), by a gentle pull on lever (A).
The (y) position can only be reached from (w), by a single, also gentle, click on lever (B).
The (x) and (y) positions will stop the derailleur cage rub that you're experiencing.