How to disable Preview popups from LSP server?

I use clangd as my LSP server and configure it with .clangd file. I don't use any additional LSP plugins. And every time I use the omnifunc on a function from any header except stdio.h and stdlib.h, it creates this annoying window:

Stackoverflow: Your post is mostly images. Add additional details to explain the problem and expected results.

The default value for completeopt option (list of options for Insert mode completion) is "menu,preview" (see :help completeopt).

You could check your configuration for this option via verbose set completeopt?.

To disable preview in this popup, configure this option without it: vim.opt.completeopt = { "menu" }