Session watermark policy has been enabled but requirement is to be able to change the font style, rotation and  username on the Watermark. 

There is a policy (Watermark custom text) to allow you to change the text font, position, rotation, etc. . Please refer to our article -  https://docs.citrix.com/en-us/citrix-virtual-apps-desktops/policies/reference/ica-policy-settings/session-watermark-policy-setting.html#watermark-custom-text

This is only possible starting with Citrix Virtual Apps and Desktops 7 2206. On previous versions, this will not work. The above link reference mentions this requirement. 

So if you need to use different fonts styles, rotation, etc., you will need to upgrade to CVAD 2206. 
 

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Problem Cause

This feature was only brought in recently in CVAD version 2206. 

Prior to this, watermark policy could be enabled but the fields could not be changed form the default. 

Information on how to edit fields for watermark session policy

https://docs.citrix.com/en-us/citrix-virtual-apps-desktops/policies/reference/ica-policy-settings/session-watermark-policy-setting.html#watermark-custom-text