cronplus.php
public function deactivate() {
		$this->clear_schedule();
		if ( !is_multisite() || wp_is_large_network() ) {
			return;
		}

		$sites = ( array ) get_site_option( $this->args[ 'name' ] . '_sites', array() );

		$sites and $sites = array_diff( $sites, [ get_current_blog_id() ] );

		foreach ( $sites as $site ) {
			switch_to_blog( $site );
			$this->clear_schedule();
		}
		restore_current_blog();

		delete_site_option( $this->args[ 'name' ] . '_sites' );
	}
public function deactivate() {
		$this->clear_schedule();
		if ( !is_multisite() || wp_is_large_network() ) {
			return;
		}

		$sites = ( array ) get_site_option( $this->args[ 'name' ] . '_sites', array() );

		$sites and $sites = array_diff( $sites, [ get_current_blog_id() ] );

		foreach ( $sites as $site ) {
			switch_to_blog( $site );
			$this->clear_schedule();
		}
		restore_current_blog();

		delete_site_option( $this->args[ 'name' ] . '_sites' );
	}
Remove all the cron on deactivation

@return void