Hello,
There isn't a standard feature in most on-screen keyboard implementations that allows you to display only the Backspace key. On-screen keyboards are usually designed to show a full set of keys for typing, and they typically don't offer the option to customize down to individual keys like the Backspace key. However, you might be able to achieve this by using third-party software that allows for more advanced customization of the keyboard layout.
If you have any specific requirements or need further assistance, feel free to let me know!
Best regards,
Karlie