Cannot deselect items with Shift + Left Mouse

I have changed some hotkeys around with Blender to my liking however…
I can select objects and parts of the mesh with Shift + Left Mouse. However, I am unable to deselect using Shift + Left Mouse.

Q: What are the selecting and deselecting values listed in the hotkey preferences? (It may be conflicting hotkey operations)

Thanks!

for deselect - I use Shift+Middle Mouse