When on any page with lists e.g. orders, customers, products etc.
The "Select All" option is located inside of the select dropdown menu.
Because "Select All" is the most used option, it makes sense to enable this function to occur when clicking the image to the left.
If a user wishes to "Select Inverse" they can then click the dropdown arrow to select this alternate option.
The option of "Deselect All" really is only relevant once options are selected and should either be left inside of the dropdown menu - or it should occur when items are selected and a user clicks on the main "Select All" image again.
This really is UX 101, limiting the amount of clicks a user has to perform in order to complete an action. Right now we are all clicking around the system so many more times than we have to.
