Sorry if this is a dupe, but I couldn't find explicitly this request elsewhere.
I'd like to request that in Views with Lists from multiple folders, Spaces, even "Everything," that you can customize the columns within different lists showing. Right now, if you want to add a custom field to a list in this cross-folder view, it will get added to all lists.
This is very useful if you have, for example, a tag you are using across various lists, and you want to see all instances of tasks with that Tag in "Everything." The tasks may have different sets of Custom Fields. But in these cross-folder views, you can only see the designed minimal columns, even though not long ago you guys brought in the ability for separate columns headers per list in these views (see Image).
Hope that's clear!