1. I added some CSS to GD > design > scripts to fix the location switcher.
2. To change the map width on http://usgreekscan.com/places/ change:
* the width of the sidebar at GD > Design > Listings tab, and/or
* the width of the map at Appearance > Widgets > GD listings sidebar section > GD Listings map widget
3. To change the width of listings in the sidebar, change the “listing width” from 135 to 100 in the popular post widget. 135% will make it wider than the space available for it.
See also https://wpgeodirectory.com/docs/widgets/#popular-post
4. To change the default outlay on the listings pages, go to GD > Design > Listings tab > Listing content section view.
To change the number to 20, please review https://wpgeodirectory.com/docs/faqs/how-do-i-change-the-number-of-listings-per-page/