With the controls in the Object Control Center you address the object under the active tab, and that is always the visible object in the foreground.
When you select another object by clicking a tab, the controls become active for the new foreground object.
You can set the values in the controls in 3 ways:
by typing a new value in the text box
by using the up/down arrows at the right side of the text box
by using the slider underneith the text box
With the radio button under the rudder control you can quickly set the rudder to the 0 position.
The maximum range of the controls can be set to your own preferences in the General Settings in case you are not happy with the default values as shown.
