Toggle to change boxes to outlines or hide completely

[simbamangu]

Feature description and context

During review, it can be difficult to see what an annotator has put the box over, as the box is filled with a translucent red.

Annotation default

With labels off, still can't see:

After deleting we can confirm it's almost certainly not an animal:

Being able to toggle all the drawn features (boxes / labels / icons) on and off would be great.

Feature sign-off requirements

When hotkey pressed, boxes disappear completely and return when hotkey released.

[simbamangu]

Making the bounding boxes thin red lines with no fill would also make it easier to see what's inside the box. This could be toggled, or maybe just become a default?

[TanyaStere42]

I think putting this to outline-only is going to be fastest, but could make the annotations more difficult to spot during initial review. What do you think @simbamangu ?