I don’t want to make you lose confidence in this, but imo I don’t think it’s achievable,at least not in the way you envision it.
Disabling one process over another, or all of them together…to on/off when needed… would require more computing power than simply keeping the object there and having the camera frame it when needed.
What many people have actually asked for is more efficient object culling.
There have been various threads and several methods proposed on the topic, but nothing has been natively integrated into GDevelop…which, in my opinion, is something sorely needed.
Anyway wish you good luck with the request.
edit:this doesn’t fit my project but for example you can have a look here