How to disable notification?

[mainendra]

Is there a way to disable notification as it's little annoying to see it every time you enter insert mode?
I've tried setting log_level = 'off' but it's not working.

my lazy config

{
        'nvimtools/none-ls.nvim',
        config = function()
            local null_ls = require('null-ls')
            null_ls.setup({
                log_level = 'off',
                sources = {
                    null_ls.builtins.formatting.stylua,
                    null_ls.builtins.diagnostics.eslint_d,
                    null_ls.builtins.code_actions.eslint_d,
                    null_ls.builtins.code_actions.gitsigns,
                    null_ls.builtins.completion.spell,
                },
            })
        end,
    },

[vunhatchuong]

opts.notify_format = ""
https://github.com/nvimtools/none-ls.nvim/blob/main/doc/CONFIG.md#notify_format-string-optional