Under which Article of Constitution Nawab Sanaullah Zehri resigned from CM office?

Under which Article of Constitution Nawab Sanaullah Zehri resigned from CM office?

نواب ثناء اللہ زہری نے آئین کے کس آرٹیکل کے تحت وزیراعلیٰ کے عہدے سے استعفیٰ دیا؟
Explanation

Sardar Sanaullah Khan Zehri  is a Pakistani politician

 Chief Minister of Balochistan from 24 December 2015 to 9 December 2017.

Zehri was the central president of the Pakistan Muslim League's Balochistan branch

He left the PML-N on 7 November 2020

Born 4 August 1961 Khuzdar,  Pakistan