How do I customize my white label branding, sidebar and login page?

Go to Settings, then SaaS Configurator. This is where you set your branding and your domain.

In the SaaS Configurator you can also customize the sidebar: hide or remove items, add custom links, and change icon sizes and shapes. You can give different sub-accounts different sidebars, which helps when you serve different niches.

You can also customize the top bar, the login page (for example an image on the left or right side, in different styles) and the getting started guide, or build your own getting started guide.

When you connect your domain there, you also get white label help docs on that domain with your logo and brand: the help docs, the API guide, the videos and the change log.