If i load the
amsmath package it doesn't allows to break by default alignments across the pages in the
alignat environments and their starred versions.
Howewer it exists the global declaration
\allowdisplaybreaks[1-4]) allowing breaks. This declaration can be placed in the preamble of the document or in anywhere of the document from which it has the effect.
Suppose you want to cancel this effect later in the document (reset to default) thereafter, Is there a global declaration opposite to
\allowdisplaybreaks to do this?