The screenshot tool in Helix Plan is there to make it easy to capture screenshots and attach them to a bug.
Go to the More menu and select Screenshot tool (or press Ctrl + Shift + M (Cmd + Shift + M)):
Capture a screenshot by pressing Print screen on your keyboard or by copying a picture into the clipboard:
You can edit the screenshot (lines, ellipses, text and cropping) and then save the changes:
After capturing the screenshots (which will be saved as .png) and attaching them, they will look like this in the bug details window:
