The Camera tab of the Preferences dialog controls Automatic Zoom.

The Animate... check box turns Automatic Zoom on or off globally.

The Follow... drop-down box below it lets you change the name of the layer whose Zoom Frame vectors should be used for Automatic Zoom. For example, if you use a layer called "Kamera" instead of "Camera," type "Kamera" in this box to activate Automatic Zoom for that layer.

(It's probably easiest to use a global layer as the camera layer, but it's not required. Only global layers are listed in the drop-down list, but you can type any name you like.)

The Enable... check box setting determines whether newly-created frames have their Animate camera check box set in Frame Properties - that is, whether Automatic Zoom is enabled for individual new frames. This is set by default.