Look there is a bug which does not let you see inventory slots,health bar and hunger please fix this its annoying

There are a few things you can try:

1. Try pressing the L or R buttons

2. Try bumping the "HUD Opacity" to 100%

3. Try disabling "Hide HUB"

4. Check if your using any resource packs that may hide the "HUD

If these 4 things don't work, then Idk what to tell you.

Awaiting Response

Thanks

You might have pressed F1

@Paolo Lopez He's on Switch. There's no F1 button on Switch

Is it working for you now?

Yes