How can I disable the separator line completely?

[subhoghoshX]

I'm talking about the white line after ##User:

Often, when I undo or make some edits, it comes down like this, hiding the text below it:

Setting the separator option to empty space doesn't work either; instead of the line character, now the empty space character hides the text.

require('CopilotChat').setup({
  separator = ' ',  -- this doesn't solve the problem
})

I appreciate any help. And a huge thanks for building this plugin!