Hi there, Hussain.

I'm here to share more information about the features under QuickBooks Labs.

As of June 2021, the features under QuickBooks Labs, except QuickBooks Themes, are no longer available. Alternatively, we still have some great templates you can make use of when customizing your invoice. You can utilize the footer options and use other spaces for things like signatures. Otherwise, you can look for 3rd party apps to create your invoice templates. 

Feel free to use this link to help you manage your sales forms: Customize invoices, estimates, and sales receipts in QuickBooks Online.

I'll be around if you need help managing your sales form.