Using ssh connections with putty, got scaled characters for terminal

Hi folks,

I have installed Version 2016 P4 and I have the problem connecting with ssh (putty) regarding the characters used. Changing window size the characters get scaled in or out. Behavior in putty itself is normal. This is indifferent what font I use in putty. Always the same behavior. What can I do to keep size unchanged?

Thx and regards