Texture seen in viewport is paler compared to the original texture Issue:

My textures in the viewport look darkened or desaturated when compared to viewing it in the UV window.
Should I adjust the colors of the texture?  or is this a a Blender issue that can be solved with some settings? My goal is to make the viewport 100% reflect the colors of the textures.
Is there a solution to this?
You are now in the viewport shading - material preview. So your color depends on the lighting you have chosen here. You can change your lighting by tapping on that shading button.
Then choose another lighting you like by tapping on the sphere.
You can even import your own .hdr lighting by tapping on that gear icon.