The topic you refer to describes how the procedure is done in the vSphere Web Client and not in the vSphere Client.
The feature parity between vSphere Client and the vSphere Web Client is a continuous effort, still in progress. In vSphere 6.7, virtual machine vApp options are not supported in the Edit Settings wizard of the vSphere Client, but only in the vSphere Web Client.
For more information about the supported features in the vSphere Client, see the Functionality Updates for the vSphere Client (https://docs.vmware.com/en/VMware-vSphere/6.5/rn/vsphere-client-65-html5-functionality-support.html).
I thought 6.7 U1 HTML5 client was full featured?
The vsphere web client is not the same thing as the vsphere client html5