Menzies was an ardent monarchist & monarchism is a founding...

Menzies was an ardent monarchist & monarchism is a founding principle of the Liberal Party. Aside from Turnball it's still part of the Liberal Party.

That's not Liberal Party policy, it's the view of members of the Liberal Party.
In the same way not all Labor members have the same views or indigenous people.

The Voice isn't a party issue, it's a referendum where individual people vote on a single issue.
I'm not a Liberal supporter, I don't support any of the current parties.