White labelling lets an account show its own accent colour, its own logos in the side menu and its own default language. A dealer can brand its customers' accounts, and allow them to brand their own.
Open the child account's edit form: select Edit on its row in Accounts > Dealers or Accounts > Consumers.
Select the Permissions tab.
Turn on Allow White Labelling, marked 1.

Select Update.
The app shows "Account Update Successfully".
The child account's owner can now brand their own account, and allow the same for accounts below theirs. You can also set the branding for them, as below.
On the same edit form, select the Branding tab.

In Default Theme, marked 1, select a colour: Purple, Blue, Pink, Red, Orange, Yellow, Green, Teal or Cyan.
A ring marks the chosen colour.
Select Upload Logos, marked 2, or one of the four logo slots above it.
The Upload Photos dialog opens.

In each of the four slots, choose a file.
A crop box opens: wide for the expanded logos, square for the collapsed ones.
Drag the crop box over the logo and select Crop.
When all four slots hold a logo, select Save.
The slots on the form now show the four logos and "4 of 4 uploaded". You must upload all four logos or none. While only some are there, Update stays unavailable. Remove all clears the four logos.
The next time a user of the account signs in or switches to it, the app uses the account's accent colour and logos. An account without its own logos shows the logos of the account above it. Users who chose a language keep it; the default language applies to users who have not chosen one.