The poster for Wendy Lindsay, the Liberal member for East Hills in Sydney's south-west, was spotted on the morning of the March 25 election on the fence at Panania Public School.

The Liberal Party holds the seat on a wafer-thin margin of just 0.1 per cent following boundary changes.

With the government in caretaker mode, official government logos may not be allowed and the ALP said the poster should be removed.

"NSW Labor will be lodging an official complaint with the NSW Electoral Commission with the view that the poster should be taken down," a party spokesman told ACM.

The commission has been contacted for comment.

Panania Public School was the site of Labor leader Chris Minns's first public appearance on polling day where he joined ALP candidate Kylie Wilkinson as members of the news media watched on.

East Hills is considered a seat Labor must win to take it to victory.

Mr Minns also visited Narwee Public School in the south-west Sydney seat of Oatley with Labor candidate Ash Ambihaipahar.

He later joined his wife, Anna, and three sons, Joe, Nick and George, to vote at Carlton South Public School in his own electorate of Kogarah.

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Labor needs to pick up 10 seats to form a majority government in the 93-member lower house.

Mr Minns was elected to NSW Parliament in 2015 and took over as opposition leader in June 2021 following two unsuccessful tilts at the top job.

The 43-year-old grew up in southern Sydney where his father was a school principal and his mother a solicitor.

His political journey began early when he joined Young Labor as a teenager.

He's been an assistant secretary for the NSW Labor Party and worked for former state Labor ministers, as well as overseeing the transport, corrections and water portfolios in opposition.

He holds Kogarah on a 0.1 per cent margin and is up against Liberal Craig Chung, a former City of Sydney councillor, and ClubsNSW whistleblower and gambling reform advocate Troy Stolz.