Adding a Asus Zenscreen as a second monitor to Imac

Hello

When adding the drivers for a second screen to the Imac all worked

But once screen is connects (Asus Zenscreen) the whole display flickers and the monitor display shows the setting with for 1-2 seconds and then without the new monitor for 1-2 seconds

So you never really can configure the new monitor settings and the second screen stays blanc

The display works fine under windows 10 on a dell computer but not on my iMAC

Any support or tips and tricks are more than appreciated

Thanks