Hi,
What version of windows is running on your server? It appears to be Windows Server 2008 R2. If that is the case the session dpi will not automatically match the client PC's dpi.
For Server 2008 R2 there was a hotfix that would allow you to change the dpi setting within the session, log off, then log back on for the new setting to take effect. Unsure if you can still get the hotfix or not. To obtain the hotfix you would need to call Microsoft customer support and request the hotfix--make it clear you are only requesting the hotfix, not asking for any support. Requesting the hotfix is free.
You cannot change the DPI setting through a Remote Desktop session on a computer that is running Windows 7 or Windows Server 2008 R2
-TP