how do I set LibreOffice 6+ to default to UTF-8?

I am in Macos or Linux and I only use UTF-8 setting for all input docs/ data/ outputs

It drives me nuts that I cannot find a setting preference for LibreOffice 6.4 allowing default to the selection I want (in this case UTF-8). When I paste text/csv into a s/sheet it defaults to UTF-16 and I have to change it to UTF-8

Why can the user not set it to whatever they want?

Perhaps a developer can comment OR am I missing something?