Then, horizontal spacing. However I had to set this in order to push the second bar that far to the left (and I don’t know if it can be a problem elsewhere)
TBH, I think individual players may also benefit from knowing the original clef, so I normally like to include the incipit in the parts. For experienced players it’s useful to know what role they have in the texture.
As I do frequently - but (to me) the original clef is irrelevant…
(I don’t want to argue the point. Clearly I have been missing something important for decades)
I must admit it doesn’t make much difference knowing the original clef when performing the music. You may hear, or know already (or don’t care), that you play a tenor part. The original clef is not indispensable.
I sometimes play middle voices on cello piccolo, preferably in tenor clef (I may use Dorico to whip up the appropriate transcription), but I always like to know whether I’m actually doing an Altus for example. Still, nice to know, but not absolutely necessary.