MAME takes whichever view is listed first in the lay file as the default from which to take the screenshot. If the first defined view is the "Screen 0 Standard (3:4)" then you don't have to use the trigger change. But, if it is different & has art associated with it then that's what you get using MAME's internal screenshot generator(unless you specify differently as Tafoid stated).
As someone who has battled with this for years, it's just easier to change the artwork folder name & only use it when you want to check out the cool new artwork & actually play the game.
My little rant: The lay files should have some sort of organization to all of them from the start. For example, the 1st view would be standard 3:4 then standard widescreen then start with the artwork definitions & go from there. Just seems to make sense to me to have a standardized method in dealing with artwork now that it has become so common.
Now the hard coded artwork is a wholly different animal to get into & deal with...
Just my 2 cents worth...
Pessimist: Oh, this can't get any worse!
Optimist: Yes, it can!
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