Currently, there is no design time functionality which will allow you to change the row of a strip. You can do this by modifying the Designer.cs file manually.
First, find the CommandBarRowElement
to which the strip is added:
Cut the strip element from the array (if the array becomes empty, remove the entire line). Then find the target row and add the cut strip element to it:
Save the Designer.cs file and reopen the design time of the form.
This scenario seems very reasonable, so I have logged it to PITS as a feature request. You can subscribe to it and vote for it. As it gets more votes, its priority will increase. Here is the link to the PITS item
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the Telerik team