Currently this feature is not customizable. We decided to minimize all the windows as we tried to mimic the behavior of Visual studio's docking control. Please let us know if this is an important feature for you as we might log it in PITS and allow you and all other people that need it to vote.
All the best,
the Telerik team
Thank you for being the most amazing .NET community! Your unfailing support is what helps us charge forward!
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