If you want the field to show on the details page, you must do something.
You can do the easiest thing and in the “Show in extra locations” option select “Details”
Then you need to instal the GD Output Locations widget in the details page sidebar. This is like a bucket that will catch all fields asdsigned to “Details” and show them.
Also, you can use widgets like GD Post Meta directly in the sidebar. This is powerful because the GD Post Meta widget has 10 more display options that aren’t available with the GD Output Locations option.
There are also tabs. You can go to the Tabs (tab) and click the field to display it in a tab.
You can do all or one (or none) but you have to do at least one or it won’t shown.
https://wpgeodirectory.com/docs-v2/places/custom/
https://wpgeodirectory.com/docs-v2/design/gd-post-meta/
https://wpgeodirectory.com/docs-v2/places/tabs/