What should I do if the large-scale activity background board feels too small?

Adjust the size of the background with a picture that fits the size.

1. Use a picture of the right size: Make sure that the selected background picture matches the screen size. The screen size is too small, no matter how you adjust it, you can't fill the whole screen.

2. Adjust the background size: you can use image editing software or online image editing tools to adjust the size of the background picture to match the screen size, and ensure that the aspect ratio of the picture is consistent to avoid distortion.