High DPI Monitor

Hello

I know that this question has been discussed many times, I have tried various solutions but I have a strange behavior that I can not correct.

I use a 4K 3840x2160 monitor, Visual Studio 2015, .net 4..7

I have a fairly large WinForms project with many forms and user controls.

In the development environment some of the forms or user controls are displayed in "readable" font sizes and other forms or user controls are displayed in very small fonts.

I set the autoscale property of the form to DPI and I set it to inherit to the use controls - I have tried to change this propertx to other values without any visible change.

I trust that the "final" application used on normal resolution displays (1920x1080 or smaller) will work properly but in teh develpment environment it's very uncomfortable to work with very small fonts.

Is there something I can do to correct this abnormal behavior ?

Thanks in advance

Pierre-Jean