How to modify the size of the "camera frame"?

yuyu.atem

Hello,

I would like to know how to control the size of this frame on the viewport:

I guess I modified it by accident because it wasn't "700 : 900", when I startes to use Daz, but I don't knoxw how to chage it.

Thank you in advance for your help!

SofaCitizen

In Render Settings -> General. You can either pick a more preferable Dimension Preset or change the numbers below.

yuyu.atem

Thank you very much!