To edit your forms in the new dashboard, first, you'll need to enable the beta form editor.
Here's how to do it:
Go to your dashboard, click on your profile from the upper right corner, then on "Edit profile".
Then you'll need to scroll down the page and "Enable beta form editor".
Now, head back to the dashboard and create a blank app.
If you want to edit/view the form that was created before, add a page to your app and search for the form's name.
From "edit base", you can edit and customize it.
You can also add a page and create a new form inside your app and edit/view it later.
Now that you're all set, enjoy designing forms:)