changing the state of the button to switch the widget

[admin]

This can be done via Custom CSS. Change Additional class (link1 in this example) and background url as needed. Repeat for each item where you want to change the hover icon.

Code:

.link1:hover .icon {
  background-image: url('/scada/resources/icons/camera.svg');
  background-size: contain;
  background-position: center center;
  background-repeat: no-repeat;
}
.link1:hover .icon img {
  visibility: hidden;
}