tried to configure hover window

after/plugin/lsp.lua

 -- [[ Configure LSP ]]
 --  This function gets run when an LSP connects to a particular buffer.
 local on_attach = function(_, bufnr)
+  -- vim.diagnostic.config {
+  --   signs = true,
+  --   underline = true,
+  --   virtual_text = false,
+  --   virtual_lines = false,
+  --   update_in_insert = true,
+  --   float = {
+  --     -- UI.
+  --     header = false,
+  --     border = 'rounded',
+  --     focusable = true,
+  --   },
+  -- }
   local signs = { Error = "", Warn = "", Hint = "", Info = "" }
   for type, icon in pairs(signs) do
     local hl = "DiagnosticSign" .. type