The phrase "as their default" is correct and usable in written English.
It can be used to indicate a standard or automatic choice that is applied unless an alternative is specified.
Example: "The software saves all files as their default in the cloud storage."
Alternatives: "as the standard option" or "by default."
With cuts in military spending that left ranks reduced, Eisenhower's generation took limited means as their default position.
Boston used the mobile, athletic Kevin Garnett — who has always played at power forward -– as their default center last season.
Any student not accepted to their choices should be assigned to their neighborhood school as their default school.
That is changing – in Ghana two years ago, only Morocco and Guinea did not have a dual-striker system as their default; in Angola, only seven sides did.
Representatives from Dell Computer and Gateway, which use Microsoft's programs as their default, said it was too early to say whether they would switch.
We still need deliberate effort to remove sexism – like the Washington Post's recent move from she/he to they as their default pronoun.
This is brilliant enough to warrant the suggestion that perhaps indie-favouring TV producers might want to rethink the xx as their default "cool" music.
Primarily employing a 5-3-2 formation, Herrera's teams go out to attack as their default and are easy on the eye.
The "Troopergate" mess still bubbling in Albany is the latest example of how New York's lawmakers use secrecy as their default mode.
People returned to out-of-favor practices like checking up on neighbors, talking to strangers, using courtesy and concern as their default modes rather than snark and indifference.
Bored with Labour and far from convinced that Mr Cameron's Tories had really changed, voters picked the Lib Dems as their default choice.
