This feature was not working correctly on most of the styles in our Style Gallery. Earlier today the Style Gallery was updated to properly manage the CSS that works with this feature.
To re-download the style go to Store Locator Plus (Advanced Options for MySLP users) | Settings | View and select a different style than you are using now. Then re-select the style you are using to force a download of the latest settings and CSS styles.
Note: if you have modified ANY of the layout settings you will want to save those changes by copying them to a separate application such as a code editor or local text editor first so you can re-apply the changes if you re-download the style from our Style Gallery server.
Store Locator Plus updates are ready to roll out for May 2017. The updates will first come to the WordPress plugins. MySLP will be updated in the next 3-4 weeks pending testing. Here is what is coming in this series of updates.
Various updates have been made to allow the Style Gallery to better support additional user experience modifiers available in the Experience and Premier Add On packs. For example the base plugin now has a Search Form Styles selection that provides access to built-in jQuery styling that makes things like drop down menus and autocomplete features look a little nicer.
The Default style in the Style Gallery has been updated. You do not need to update the base plugin to take advantage of this update. If you are already using the Default style select a different style from the Settings / View tab in Store Locator Plus (start with Advaned Options in MySLP) and switch it back to Default to pull the new style from the Style Gallery server. If you have SLP 4.7.10 it will take advantage of some new HTML attributes to better style the search form layout, especially when dropping labels in front of some input fields on the locator.