I have ran a quick test, and the Width of the grid is the same as is set in the markup in pixels, or if I set it to 100% percent, then I get a width of 1500px or so. In order to understand whether it is a bug, we will require some more details about the grid configuration.
Can this behavior be seen in our demos
Could you test the sample project shared in the Update all, individual or selected rows using RadGrid with InPlace edit mode
KB article and see whether the issue is still present?
Could you describe the steps to replicate the problem?
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