About the problem reported in this Question: An application, which is DPI-unaware by design, relying on Windows virtualization to scale its UI content, suddenly (although after some modifications, leading to a minor release update) – and apparently without an observable reason – becomes DPI-Aware (System Aware). The application also relies on an interpretation of the … Read more
EDIT: As of .NET 4.7, windows forms has improved support for High DPI. Read more about it on docs.microsoft.com It only works for Win 10 Creators Update and higher though, so it might not be feasible to use this yet depending on your user base. Difficult, but not impossible. Your best option is to move … Read more
Once you go past 100% (or 125% with the “XP-style DPI scaling” checkbox ticked), Windows by default takes over the scaling of your UI. It does so by having your app render its output to a bitmap and drawing that bitmap to the screen. The rescaling of that bitmap makes the text inevitably look fuzzy. … Read more