https://learn.microsoft.com/en-us/dotnet/api/system.windows.forms.form.maximumsizechanged?view=netframework-4.8.1&viewFallbackFrom=windowsdesktop-10.0
Form.MaximumSizeChanged Event (System.Windows.Forms) | Microsoft Learn
Occurs when the value of the MaximumSize property has changed.
event systemwindows formsmicrosoftlearn