How to change the number of columns in grid view in Member Directory
By default, 3 columns are displayed in the Member Directory in a grid view. You can use a custom CSS code to change the number of columns.

The CSS code below changes the profile card width to display 4 columns. You can override the style by adding CSS code to the field "Additional CSS" on wp-admin > Appearance > Customize > Additional CSS.
Example 01 influences all screens:
Example 02 influences only large screens:
Here is the result when you use the code above.

NOTE: We have created this code example to provide guidance and to make it easier for you to implement this code into your website. However, we are not able to provide any support when it comes to customizing the plugin. If you need help implementing this code, please hire a developer.