Manual:$wgGroupsRemoveFromSelf/yo

Details
$wgGroupsRemoveFromSelf allow users to remove their own user rights.

 The syntax since 1.14 is: 

 The syntax of MW 1.12 - 1.13 is: 

Changes in 1.14.0
In r39368, the way this variable works was changed. Before, it allowed every user to remove groups from themselves, now it can be filtered on a per-group basis. Sintasi tuntun jẹ  eyiti ngbanilaaye olumulo eyikeyi ninu ẹgbẹ “ẹgbẹ1” lati yọ awọn ẹgbẹ “group2” ati “ẹgbẹ3” kuro ni ara wọn. Sintasi atijọ yoo tun ṣiṣẹ, gbigba gbogbo olumulo laaye lati yọ awọn ẹgbẹ kuro ninu ara wọn, ṣugbọn o gba ọ niyanju pe ki o lo $ 1 dipo.

You may use  to allow users in that group to remove every group from themselves.