To remove a section from your theme, first delete the section through the theme editor, then delete the theme file.
Delete the section
Open the theme editor (Customize), then click the trash icon beside the section.
Click Save.
Delete the theme file
Click the ••• menu in the theme editor header, then select Edit code.
Open the Sections folder and scroll down to the files that begin with "pxu-".
Locate and click the section's theme file, then click the trash icon beside the file to delete it.