lennaert My question was how to find such instance in a large existing project, which may not have a dedicated layout for storing default instances. And even it does, not all objects may be there. And even if they are, the default instance may change suddenly if you change the order of layouts.
I was working on a big game last year and there was a very important sprite with lots of instance variables and behaviors, which was used on many layouts.
I intentionally put the first instance of it on a separate layout and filled in all the default properties. For example, I put these default values: variable isActivated=0, MoveTo Speed=500
That was working for a while but then broke. Some other instance of this sprite became the default one. So when this sprite was added in layout editor it was created with these values: variable isActivated=1, MoveTo Speed=200 I had to manually edit them and about a dozen other parameters, which was super annoying. And I couldn't find the instance which had become the default one..