Cannot turn on hitboxes with F3+B

I seem to be unable to turn on hitboxes using F3+B, I also tried using Fn+F3+B, but that didn't work either. I really like the hitboxes feature, cause it helps me a lot sometimes, but since I got this new laptop like a year ago, I haven't been able to use the hitboxes feature. I dont have any idea why, I use Windows 10 on an HP laptop. Yes, my laptop is old, but that shouldn't affect anything, please fix this!!!!!!!