Thanks. Don't know why the tabs array is not filled with objects like that to begin with, but that worked. I do get a warning "tabs[0] object found, string expected" - just a warning, so nbd.
Also funny to me that the prop in this case is disabled when in most cases it's enable.
I was thinking maybe it was programmatically linked to the style that is used, but that doesn't seem to be the case.
Any way to make the tab size a % of the window, instead of px?