nvim/after/plugin/foldsign.lua

local status_ok, foldsign = pcall(require, "nvim-foldsign")
if not status_ok then
	return
end

foldsign.setup {
  offset = -2,
  foldsigns = {
    open = 'V',
    close = '>',
    seps = { '│', '┃' },
  }
}