I noticed that changing the input routing of mulitple tracks with Q-Link only works while holding Shift + Alt. It doesn´t work with Q-Link activated by clicking the assigned button in the MixConsole toolbar.
Tested on two systems with Cubase 13 Pro/14 Pro each on Windows 10.
Can anybody confirm this?
Yep, same over here.
EDIT: Seems to only happen to MIDI/Instrument channels on my system. Audio is fine.
Surprisingly, the shortcuts to configure input routing for all selected channels is the same as the shortcut for temporarily activating the Q-Link.
Tested it on C13pro, and it worked.
Strange.
I can´t find a key command that is supposed to change all sorts of selected input routings to your liking. At least it´s not listed as a default as far as I can see. And the only factory preset option to change input routings via PLE is to set all audio inputs to NoBus. The fact that I didn´t find it doesn´t necessarily mean that it´s not there 
Can you please point me into the right direction?
I think Steffen meant the Alt/Opt + Shift combination. Since it didn’t address your issue I advise to just ignore that post.