This page lets you configure whether ReSharper should increase or decrease the number of blank lines around namespaces, members, regions and groups of import directives. You can adjust the values and check the preview pane at the bottom of the page to see how your preferences affect the code.
Options in the Preserve Existing Formatting section are only applied when ReSharper reformats existing code whereas the Blank Lines section contains options that also take effect when you type new code.
The options that you configure on this page apply in the following cases:
When code is automatically formatted on editing or after pasting (you can toggle auto-formatting on the page of ReSharper options (Alt+R,O).
When you reformat existing code.
If there are .editorconfig files that affect your solution, preferences on this page could be overridden by EditorConfig styles. You will see a yellow warning if at least one preference on the page is overridden by EditorConfig styles for the current file, each overridden preference will also be highlighted with yellow. For example: