phpMyAdmin configuration storage is not completely configured message
You do not need the features to use phpMyAdmin. You can read more about what they include in the phpMyAdmin documentation.

To disable, just remove the corresponding lines from your config.inc.php (you can start here in the documentation; each entry up to and including $cfg['Servers'][$i]['designer_coords'] relates to the phpMyAdmin Configuration Storage features; if you have any of those lines in your config.inc.php you can simply remove them). You also may have $cfg['Servers'][$i]['controluser'] and $cfg['Servers'][$i]['controlpass'] entries, which generally are only used for the Configuration Storage features as well and in most cases can be removed.