Global Dynamic in Full Score

Hey there,
I searched the forum for half an hour and I couldn’t find anything though I’m sure it had been already asked. So I’m sorry.
How do I make ONE for example decresendo sign in my Full Score above the highest system which will be applied in all my single parts - so that I basically only have 1 sign in my Full Score and not 20 of them (above each instrument)…

Like a ritardando line which is only above the 1st system and is applied in all parts…

You could use System Text for a “dim…”, I suppose – though obivously it wouldn’t playback.

Otherwise, you’ll have to hide the dynamics in the score.

Yes, I could use text together with the ‘alt’ key -or like you said, hide the dynamics…I thought there would be a more elegant solution…

thanx anyway