Even set the Citrix policy "Do not adjust the user’s default printer", the default printer becomes "Webex Document Loader" after logging in.
 

1. Set the Default printer policy setting to 'Set default printer to the client's main printer'.
2. Set the Default printer on the user endpoint where the Citrix Workspace is installed not on the VDA.
3. Restart the session.

Problem Cause

Default printer setting specifies how the default printer on the user device is established in a session.

To use the current Remote Desktop Services or Windows user profile setting for the default printer, select Do not adjust the user’s default printer. If  choose this option, the default printer is not saved in the profile and it does not change according to other session or client properties.
The default printer in a session is the first printer auto-created in the session, which is either:

・The first printer added locally to the Windows server in Control Panel > Devices and Printers.
・The first auto-created printer, if there are no printers added locally to the server.