PRICING TIER: All
APPOINTMENT VERSION: Single & Multiple
CLICK: Layout Tab > Customer View Header Text
Within the Customer View Header Text section, you can change the company name in "First Line Text"
NOTE:
This assumes you are not using your logo in the header part of the Customer View.
If you are, then changing the header text values will have no impact.
To verify if you are using a logo, check the Customer View Logo section within the "Layout" tab of Site Administration.