Response from the site administrator
Dav999, 10.04.2018
The scale option resets itself to 1 because the window wouldn't fit on screen (1792x960 in scale 2). The scale number becomes red to indicate this.
You can set the scale to a non-whole number, by editing the configuration file at %appdata%\LOVE\ved\settings.lua. Pixels might look a bit strange sometimes, but otherwise I think a scale of 1.4 would work well for 1366x768, or maybe 1.5 if the height of your window title bar plus the task bar are small enough.
I think I'll also make an option for non-integer scaling within Ved, so it'd be easier to customize the scaling if both 1x or 2x are not really an option.
[Edit] Ved 1.3.2 has much better scale settings, clarifying when a window is too large to fit, allowing non-integer input, and allowing the user to force the scale options.