First, open the PS software in the computer and select any lasso tool in the toolbar.

Step 2 use tools

Then use the lasso tool to select the part of the picture that needs to be cut off.

Step 3 Use shortcut keys

Then press ctrl+Enter to generate the selection.

4, free to change the size

Finally, press ctrl+shift+j to cut out the graph, right-click the graph, and select Free Transform to resize.