FPS Limiter - ROG Ally - WTF?

So, I've read innumerable posts explaining how the FPS Limiter works but i simply don't understand it.

All I know is that when I set it nothing changes.

I've read about LFC working now, VRR working now, frame doubline, frame tripling and a load of calculations explaining everything.

I just want to be able to cap my frame rate and then see steam overlay showing a capping of frames.

Can anyone help, please?
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