What you're showing in your image is the Reflected Ceiling Plans - the Ceiling Types are further down in the Project Browser; under Families » Ceilings. But that's a mute point, because the Default Ceiling Height is not stored within the Ceiling Type, and therefore, it is not accessible through the Project Browser.
In order to establish a new Default Height, activate the Ceiling command and, before creating the Ceiling, enter the desired value under Properties. This will become the new Default Height for ALL new Ceilings, regardless of their Type.
Corey D. ────────────────────────────────────────────────────────────────────── ⁞|⁞ Please use .Accept as Solution and Give Kudos as appropriate to further enhance these forums. Thank you!