Hello zansqi,
Welcome to Apple Support Communities!
We want to help resolve the issue so you can delete the app; and reinstall it if you prefer.
Try using these steps to delete the app from your Home Screen from the icon you provided the screenshot of:
"How to delete an app
- Touch and hold the app.
- Tap Remove App
.

3. Tap Delete App, then tap Delete to confirm.
Keep in mind that some built-in Apple apps can't be deleted from your device, so you might not see the option to delete an app. Here’s a list of built-in Apple apps you can delete from your device. If you can't delete an app that's not made by Apple, disable parental controls, then try deleting the app again.
If you touch and hold an app from the Home Screen and the apps start to jiggle:
- Tap the Remove icon
in the upper-left corner of the app.

2. Tap Delete App, then tap Delete to confirm.
3. Tap Done."
This Apple Support page has the full details: Delete apps on your iPhone, iPad, and iPod touch - Apple Support
Once the app is deleted this way, please restart your device. This should resolve the issue so can reinstall it from the App Store if you want it back on your device.
We hope this helps to remove the non-functional app.
Cheers!