Can the UI be configured on the Dash 35B?

Yes. The Dash35B display UI can be customized. The UI is source code is in a VESC Package that can be downloaded here:
https://github.com/vedderb/vesc_pkg/tree/main/dash35b

Further documentation for LispBM scripting can be found here:
https://github.com/vedderb/bldc/blob/master/lispBM/README.md

The files in the package can be edited and adapted. Uploading the file main.lisp will load the update code.