Shared Pages acts like Forms in Nova and these are available to use across different apps. Shared pages can be a long form or a Multistep form.
To create a long form - shared page:
Go to the Nova application builder.
On the left-hand side expand the Shared Pages section by clicking
icon.
Click the add Shared Page icon
and select Long form.
An object selector should pop up. Expand the dropdown and select the object that will be used for the form.
Then, click Create form.
Lastly, based on your application requirement add the necessary page components, fields, or relationships.
New records created with the form will be of the selected object type. Just like classic forms, you may create multiple versions of shared pages per object.