Previously (C13), one could rename QC names by double clicking the QC and entering a new name. A similar feature has been requested for automation lanes
here Can I rename CC controllers in Cubase 8? - #2 by Martin.Jirsak
and here Being able to rename CCs - #3 by mart
and here Rename CC's
and here Rename Midi CC lanes? - #8 by riflinka
Now, with C14 a double click allows you to change the value of the QC, but not its name anymore. Right click context menu yields no option to do so as well.