I'm sorry but that is just wishful thinking. The public really aren't that stupid that the papers (which only a few read these days anyway) can greatly influence anything.
Here is a list of the national papers, ranked by circulation.
Rounding up and totting up, and assuming that no-one reads two different papers in a day, and the total of papers in circulation in a day is about 8.7 million. There are 45.3 million registered voters in the UK.
So fewer than one in 5 voters reads a paper. Therefore anyone who thinks that Labour would be 20 points better off if the papers were all favourable to Labour can't do maths.
I don't read a physical newspaper but I get delivered to my email box each day 4 UK papers the guardian, the times and the ft, and the Herald. I also get politico, the Washington times, the Irish times and Bloomberg and I am sure that in these days of multi platform news I am not the only one. We are all influenced by the media and not only by newspapers and news programmes but by TV programmes, film and radio.