Hi @wujerry2000 if you're on an Enterprise plan, you get the option to hide this button under Settings->Branding:
If you're not on an Enterprise plan, you could switch the button to say "Powered by Retool" instead of functioning as a navigation menu.
Keep in mind that users with edit access can still log in to your Retool instance directly to access the home page.
If you want to protect certain content from users, you'll want to ensure you're at least on the Business plan, which includes permissions settings. You can read more about our pricing & features here