This is probably a foreign language issue. The larger labels cause the interface to not fit on the screen. We only officially support the english language version of Dreamweaver. I can look into options on how to fix this issue.
A solution that might work for now is to use the Data Bridge BETA linked from the top of this website. It will allow you to use the standard recordset dialog to create mysqli recordsets. That uses the native Dreamweaver dialog windows which have foreign language support.