Home Dashboard
First, pick your website project from your Home Dashboard view. You can jump to the Editor or Page list:
Page List
Under the page list you can click under actions icons for draft preview or the "globe" icon to see the live (published) page
Editor
Press on the Preview Draft page to preview the current page you are editing. This is the draft version. If you are happy with it, you can click Publish and then click on the live page URL link from Publish menu.
Note: You can also navigate your previews using url. For example: https://app.pineapplebuilder.com/pineapple-1/website-name/preview/index
where:
pineapple-1 - name of your workspace
website-name - website name
preview - preview
index - home page