To hide the About section, just tap the “Hide” button at the bottom of the section.
You can also hide or show the About section from the Profile screen. Tap the silhouette at the top right of the main screen. In the “General” section, if the About section is being shown, you can tap the “Hide ‘About’ section” button to hide the About section. If the About section has been hidden, tap the “Show ‘About’ section” button.