Unfortunately, the solution to these sorts of issues for laptops seems to depend on every game individually. I remember Sonic Generations not running on my old laptops discrete card and only seeing the integrated graphics until I deleted or modified a line in the configuration file.
It's a fairly common issue with Nvidia notebook cards it
seems (I just randomly googled and found that)
What you'll likely want to try first is to go into NVidia control panel, manage 3d settings, find the Trails executable and maybe also the configuration tool (I don't own the game so I'm unsure what's all in the directory) and set both to the preferred graphics processor of your 750m. Can't guarantee it will work, though