At first I used Gianluca’s solution (“SSMS in High-DPI Displays: How to Stop the Madness“), but it wasn’t perfect – fonts in some places were really blurry, and some dialogs were totally unusable. He has several examples in his post if you’re curious. But I have several too.
This is the previous version of SSMS (13.0.15600.2), out of the box, which now foregoes any type of DPI scaling at all, using the old-fashioned jaggy type we’ve been suffering for decades (except check out the smooth text on the About dialog title bar!).
Cf Gianluca Sartori. There’s still some work to do, but more and more of us are moving to high-resolution and 4K monitors; 1080p isn’t cutting it anymore.