I am not sure why is that happenining. It working fine for me
Also I modified the measure a bit to make each participant appear in a new row
List = CALCULATE(CONCATENATEX(Participants,Participants[Participants],UNICHAR(10)),ALL(Participants[Participants]))
Maybe I am misunderstanding, but it looks like you can't select "Alice" but rather you have to select all entries where Alice exists. That would be difficult every time you want to pick a new name.
@Ross73312 Ok, I think you actually nailed it. Here is what I did - it seems to work!
• Created a new Slicer table for just the distinct session / participant combos (really just a copy of the participants table)
• Used the Participants field from that Slicer table in the slicer
• Joined the Slicer table to the main Sessions table and made sure to filter in both directions