Can you change the default callouts automatically added when creating a software simulation?

Hi, I have been testing out the software simulation feature as I will need to use this for a project soon. It is really good and so easy to use but I had a question, is it possible to change the default callout style without doing so individually? I was able to change the colour across the project by modifying the colour style but if I want a gradient type effect or an oval rather than square callout I can't see anywhere I make that change as a project-wide change. Just wanting to make sure I get everything set up correctly before starting the project. Any other tips on creating simulations you have come across would also be appreciated. Thanks.