I have a page with a BCS webpart in it. I have displayed 20+ columns.

And the parameter textbox is TOO LONG, and I need to scroll to the right in order to add another parameter.

Please see screenshot below. How do I edit this?

edit the web parts' properties, and manually set the width. Or put it in a zone that isn't as wide.

I already tried that, webpart becomes small but I still need to scroll in that small window until the right most part to find the Add.

I also tried modifying the css width: 300px; using a CEWB but it seems that the length of the textbox is being modified/reset to the original state (width is @ 100%).

Hi,

You can set the width using Jquery in the FilterValuesPickerDialog.aspx.

More information:

Jquery Width

Hope this will help.

Best Regards