Is it possible to resize survey popup window?

Yes. To do this in the collector code, you need to appropriately modify width and height parameters.

Example

window.open( ‘<survey link>’, ”,’width=980,height=600,toolbar=0,scrollbars=yes’ );

The default values are 980 and 600 px, but they can be changed. The modified code should be pasted into the page where the survey will be launched.