Hi @zsliu98 - I was able to reproduce the problem. The root of the issue is how the JUCE VST wrapper handles DPI scaling for the VST plugin child window.
I’ve been trying to limit my changes to the JUCE graphics code and I’m reluctant to make changes to the VST wrapper that may have unintended consequences.
I’ll give it some more thought and discuss it with the JUCE team.
Matt