If the thing is a thumbnail from the corner of the display, simply click it to edit the screenshot. Or look forward to the screenshot to save on your desktop. You can make the floating thumbnail disappear more rapidly by clicking and dragging it off the display. William Antonelli/Insider PCMag, https://wallpaperpictures14.pages.dev/?search=how%20to%20take%20a%20screenshot%20on%20a%20mac