Merging boss and player abilities in the same timeline

Hello, first of all I hope im posting this in the correct place.
I haven’t used WarcraftLogs in a long time. But i remember you could “click” on abilities and then see them all together in the same timeline (Being player and bosses abilities so you can see when they do overlap and such).

Today I have tried doing this but I can only view the ones corresponding to either a player or a boss. I cannot select and merge them all in the same timeline.

Has this changed since the last time I did it? (12+ months) Is it possible to still accomplish what I try to do? Am I missing something?

Thank you for the attention and sorry for the inconvenience.