To better assist you, we may require a screenshot. The steps below should assist you:
Select > New to take a screenshot.
Rectangular mode is selected by default. You can change the shape of your snip by choosing one of the following options in the toolbar: rectangular mode, Window mode, Full-screen mode, and Free-form mode.
The screenshot is automatically copied to your clipboard. A notification also appears once you're finished taking a screenshot, select it for more editing options.