(Found) Parallel Earth where men disappear...

[Evelyn]

... and the women re-create the world to suit their skills and talents. At the same time the men of Earth experience their women disappearing & they re-make the same earth to their ideas. It was a paperback in the 1970's I think.

 

[Victoria Silverwolf]

This is The Disappearance by Philip Wylie, first published in 1951 and reprinted several times thereafter.

The Disappearance - University of Nebraska Press

On a lazy, quiet afternoon, in the blink of an eye, our world shatters into two parallel universes as men vanish from women and women from men. After families and loved ones separate from one another, life continues in very different ways for men and women, boys and girls. An explosion of violence sweeps one world that still operates technologically; social stability and peace in the other are offset by famine and a widespread breakdown in machinery and science. And as we learn from the fascinating parallel stories of a brilliant couple, Bill and Paula Gaunt, the foundations of relationships, love, and sex are scrutinized, tested, and sometimes redefined in both worlds. The radically divergent trajectories of the gendered histories reveal stark truths about the rigidly defined expectations placed on men and women and their sexual relationships and make clear how much society depends on interconnection between the sexes.

 

[Evelyn]

Victoria, I can't thank you enough. This has plagued me for years!