How do you remove the active module from the main menu goups?

[ankitlakhara]

This is the right way.
You should comment some code lines in system file:
include/MVC/View/SugarView.php
Code lines:

if (!empty($moduleTab)) {
    $topTabs[$moduleTab] = $app_list_strings['moduleList'][$moduleTab];
    if (count($topTabs) >= $max_tabs - 1) {
        $extraTabs[$moduleTab] = $app_list_strings['moduleList'][$moduleTab];
    }
}