The 4.5.1 release of Horizon Client for iOS fixes an issue with VPN connections.
Better display quality in remote desktops and applications
You can use the High Resolution Mode feature to obtain the best display quality in remote desktops and applications.
Support for Workspace ONE Mode
Beginning with Horizon 7 version 7.2, a Horizon administrator can enable Workspace ONE mode for a Connection Server instance. If you connect to a Workspace ONE mode enabled server in Horizon Client for iOS, you are redirected to the Workspace ONE portal to launch your entitled desktops and applications.