What if it refuses to remove part of the background even though I used "Mark Areas to Remove" tool several times?

If PowerPoint is having trouble removing a particular part of the background even after using the "Mark Areas to Remove" tool, there are a few things you can try:

Adjust the size of the marquee: Sometimes, making the marquee larger or smaller can help PowerPoint better detect which areas to keep or remove. Try adjusting the size of the marquee and see if that improves the selection.

Try using the "Mark Areas to Keep" tool: In some cases, using the "Mark Areas to Keep" tool to select the subject of the image can help PowerPoint better understand which parts of the image should be removed.

Use a different tool: If the "Remove Background" tool isn't working as expected, you can try using a different tool, such as the "Set Transparent Color" option in the "Format Picture" menu. This tool allows you to select a single color in the image to make transparent.

Edit the image in another application: If all else fails, you can try editing the image in another application that has more advanced image editing tools, such as Adobe Photoshop or GIMP. These applications allow for more precise control over background removal and other image editing tasks.