A setting that causes confusing problems.
WHAT IT LIMITS
How many individual form fields may be submitted at once.
WHY IT MATTERS
Page builders, large menus, theme options and bulk edit screens submit many fields.
Exceed the limit and the submission is truncated.
THE SYMPTOM
Settings that will not save Menu items disappearing Only part of a form applying No error message at all
That last part is what makes it confusing. Nothing indicates a failure.
WHERE IT SHOWS MOST
WordPress menus with many items Page builder settings Large product edits in WooCommerce Theme options pages
HOW TO FIX IT
Raise max_input_vars in cPanel.
WHAT VALUE
Enough for your largest form. A menu with a hundred items needs a substantially higher value than the default.
WHEN TO SUSPECT IT
Anything that saves partially, or silently does not save, with no error.
