How to color the format plane of the shopping mall?

To import a picture into ps, you can use the magic wand tool to select the range where you want to add color, provided that the range is a closed area; You can also use the exploration box selection tool to select the range you want to fill. The exploration box selection tool is aimed at the unclosed space.

After selecting the space, select the desired color, and use the color filling tool (paint bucket or gradient tool) to add color to the selected area.