Hello Myron,
Indeed the minScreenWidth option is not applied when using multi column headers. I have logged the issue in our GitHub repository and the developers will look into it as soon as possible. You can monitor the status of the issue in the link below:
As a token of gratitude for reporting the issue to us you will find your Telerik points updated. I apologize for any inconvenience this may cause you.
Regards,
Viktor Tachev
Progress Telerik
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