Webstorm change its own scaling after connecting secondary monitor (HDMI)

Hello 

I have problem with webstorm. After I connect secondary monitor webstorm is getting hudge and pixeled. (see attachments)

Here is a video of what happens after I attach external monitor. https://mega.nz/#!H9kAxYQa!B8FwRxOUbNXLdGk3Nls9mbV912HmmvsPjndHrrDrDjc

I've used webstorm for 2 years with 2 monitors never had this problem. I think this happened after update to 2017.2.2 from 2017.2.1

after:

before: