How to apply a server template

I have noticed that in my Virtual Servers templates >> Apache website >> “Directives and settings for new websites” that I need to change the DirectoryIndex settings

Having done that I can’t figure out how to apply the new setting to existing web sites. Is that possible?

I guess the lack of answers means - “can’t be done”.

Yeah, the template is just that – a template for new domains.

If you’d like to change those settings for existing domains, I believe you’d need to manually update the Apache config for those existing domains.