How To disable Page Configuration tab in typo3 backend

Add Below Code in your Page Typoscript Configuration.

# For Not Displaying page Configuration tab

TCEFORM.pages.tx_fed_page_flexform {

# You cannot edit the Page Configuration field now:

disabled = 1

}

TCEFORM.pages.tx_fed_page_flexform_sub {

# You cannot edit the Page Page Configuration - subpages field now:

disabled = 1

}