How can I launch a form on the click of a button?

While building a form, add a field to the form using the Button field type. You can place this button anywhere on the form. Alternatively, you can click Toolbar at the top of the form layout or at the top of a Grid section and click New Button. This button is placed only at the top of the form or Grid section respectively.

While defining the properties of the button, select the Link a Form action. Then, select the form that you want to link and perform the necessary mapping to identify the instance of the form.