Adding custom color to Oralce Forms

Hi,

Whenever we have multiple instances open, it sometimes become difficult to distinguish which instance is which as they all look the same.

Ive heard somewhere that it is possible to color code the Forms Header or the Menu bar so the development instance can be a unique color, the br/fix its own color, and the production instance its own color.

Please help me figure out where this change can be made so my team can have a smoother and faster workflow while working with multiple instances open, with no subconscious second-guessing.

(Also, we will not have to worry about making accidental changes intended for test instances that might be made in production)