Sorry to hear that, while a device may not be supported by Enterprise IT. An attempt should be made to duplicate the issue on a supported device to validate no systemic issues exist.
For Horizon graphical issues, it typically comes down to the Horizon Client version. Recently, the Log4J vulnerability forced all Horizon Enterprise customers to upgrade to the latest Horizon Release (2111) in December.
There have been many reports of graphical issues on users running 5.x or older Horizon clients. If you have administrative access to your Macbook, please download the latest release: Download VMware Horizon Clients - VMware Customer Connect
