I have no idea

lua/plugins/cmp.lua

@@ -9,7 +9,7 @@ local config = function()
         mapping = cmp.mapping.preset.insert({
             ["<C-b>"] = cmp.mapping.scroll_docs( -4),
             ["<C-f>"] = cmp.mapping.scroll_docs(4),
-            ["<c-space>"] = cmp.mapping.complete(),
+            ["<c-h>"] = cmp.mapping.complete(),
             ["<c-e>"] = cmp.mapping.abort(),
             ["<cr>"] = cmp.mapping.confirm({ select = true }),
             ["<tab>"] = cmp.mapping.select_next_item(),