Vertex AI Freeform does not provide options for direct keyboard customization within its prompt interface. The primary emphasis of Freeform lies in prompt engineering and engaging with large language models via text, images, audio, or video prompts. There is no inherent capability to alter keyboard shortcuts or behaviors that pertain specifically to the prompt input area. Modifications to keyboard behavior would have to be managed at the operating system level or through browser extensions.

If you are looking for this feature to implement a raise request in an issue tracker with a complete description of the issue, the Engineering team will look at the issue for future implementation.