We've just added the autocomplete functionality in our Step Controls editor to enhance your workflow:

Liquid filters: Apply Liquid filters (e.g. upcase) directly within autocomplete suggestions for better content control.
Seamless navigation: Use arrow keys to navigate suggestions, press ENTER to select the variable, or press ESC to close the dropdown quickly.
Variable editing: Easily navigate and edit variables within curly braces. Errors are now shown instantly when dealing with incomplete or invalid variables.

Novu changelog

Autocomplete in Step Controls Editor