How come I have Windows 10 64 bit but INTEL hd graphic control panel only has 32 color depth option no 64 option ?

64-bit refers to the processor's addressing spectrum, which is more for programmers.

32-bit color depth is a reference to how many colors it can use, which has nothing to do with processing.

there is no 64-bit color palette. there is 48-bit, but it is overkill.

32-bit is over 16 million colors. i defy you to even name 100 colors...

that said, 48-bit is 281 TRILLION colors, which, as i said, is overkill.

if you consider that Windows 95 was 8-bit, and had 256 colors, i'd say 16 million is much more realistic.

if you want better, get a video card...

No action is necessary.  The 32-bit color depth is standard, and refers to the color detail on your graphics card.  It's unlikely that you could perceive more shades of color.  Rest assured that your computer will access video memory as 64-bit (or greater) chunks, so you'll still get the best video performance possible.

Colour depth is totally unrelated to whether the CPU or OS is 32 or 64 bit.

32 bit colour means 8 bits each for red, green, blue and alpha (transparency).

More info:

https://en.wikipedia.org/wiki/RGBA_color_model