the former is text and the latter is an icon. They are in different forms and looks inharmonious.
Therefore, we can see the left bottom corner is not suitable for text button. How about
changing it to an icon? The problem is that there isn’t an accustomed icon to represent whitelist,
while a random one may cause confusion. So in this view, no matter icon or text we use, we
cannot get both understandability and harmony. Let’s click “Mailboxes” and go to the upper
view, as shown in figure 8-5.
Figure 8- 5 Mailboxes
The top left and bottom left areas are both empty, as shown in figure 8-5. The bottom left is
not suitable for the whitelist button as we’ve discussed just now. So let’s put the button on top
left corner to see how it looks, as shown in figure 8-6.