What is the crowd's opinion of Mosaico?

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Cool! There is a similar app called Mosaico Window Manager http://www.soulidstudio.com/ which can save layouts of wndows, I am not sure between resolution changes though.

As someone with three monitors I had the same issue, to solve it I use windowed mode and ignore the borders. I also use an app called Mosaico - http://www.soulidstudio.com/ to control where the screens are located

For multiple workspaces and for tiling window manager. There are probably more, but these were the first ones available that I could find for Windows.