Could you please open a support ticket and send us a sample video that demonstrates the behavior? What are the exact steps to reproduce it? The exact test content? What is the editor's configuration? Under which browser are you testing? We will check the details locally and our best to provide a solution.
Regarding the second question:
Could you please clarify what is your exact scenario? How have you set the different instances of RadEditor on the desired page? In general, you can specify the desired width, by setting the editor's width
property in the respective ConfigFile.xml
the Telerik team
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