Its hard to work through RDC at present. All started when i updated my Windows laptop to Windows 10 from Windows 7.
The fonts gone so small almost unreadable on my MAC. 
There is no zoom option. Almost tried all resolutions but didnt worked.
everything got zoomed out and feeble.

Please provide an update to fix this ASAP.

On Windows 7 it was working fine with normal fonts. Release update compatible to Windows 10

Hi,

It displayed correctly in my tests when connecting to a Windows 10 system.

First you can test to upgrade RDC to 8.0.19. It was just released and you can update it in APP Store.

If issue still exists, since it is not caused by screen resolution, test to update the driver of the display card on your Windows 10 system.