I am on Dorico 3.5.11.
I have been trying to adjust the playback length of marcato notes. First, I tried it in Expression Map. There is a length percentage adjustment there, however, it did not work at all.
Luckily, I found a forum post said that I should adjust the playback length in Playback Option, which works. However, I found out that the marcato one did not work correctly. When I set it at 50% of the written duration, it adjusts the playback to about 75% of the note duration. I will attach a picture to show the result on my computer when I set the duration at 50%.