Remove index.php? from URL with question mark | Codeigniter

please use default .htaccess from CI4.

replace this line:
RewriteRule ^([\s\S]*)$ index.php/$1 [L,NC,QSA]

with this line:
RewriteRule ^(.*)$ index.php?/$1 [L,QSA]

Then,set:
App -> Config -> App.php :

public $indexPage = ''; //'index.php';

This is working for me.