To explain why it is currently not possible to set default resolution from Citrix Storefront in the Cloud.

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Instructions

In on-premise versions of Citrix Storefront, system administrators might use the ability to edit the parameters of the default ICA file to set the initial screen size of an application or a desktop presented to a user as described in https://support.citrix.com/article/CTX210307

As this method requires direct access to the Storefront server in order to edit the ica file, and customers do not have direct access to the back end of the server that their Cloud Storefront sits on, there is no way for customers to achieve this in the Cloud/Citrix Workspace at present, either directly or indirectly.

https://support.citrix.com/article/CTX210307