Most WordPress users who come across the max input vars error can solve the problem by editing their site’s .user.ini file.
However, it’s worth noting that this method won’t successfully resolve the issue for everyone. Some users will need to try updating their .htaccess or wp-config.php files instead.
As a final measure, if none of these file edits turn out to be successful, you’ll need to contact your host provider and ask them to make the adjustments for you.
00:00 - Start
00:21 - What does the "max input vars" error mean?
01:01 - How to check your WordPress Server Site Health
02:18 - Method 1: Update ".user.ini" file
04:15 - Method 2: Update ".htaccess" file
05:14 - Method 3: Update "wp-config.php" file
05:23 - Method 4: Contact host customer service
Full blog post: https://nichetwins.com/how-to-increase-max-input-vars-in-wordpress/
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How to Increase Max Input Vars in WordPress (Quickly) | NatokHD