
run game once to make your own save file then restart emulator, right click game and choose Save Data Location

examples: 

ryujinx emulator - you can upscale res upto 4k
D:\Program Files (x86)\Xenoblade Chronicles 2\emu\portable\bis\user\save\000000000000000e\0

yuzu emulator - you can switch between opengl and vulkan
D:\yuzu early access\user\nand\user\save\0000000000000000\6106EE52B872A6095222FC25EA00052B\0100E95004038000