Why does pressing enter not exit the text box in a fillable form?

Hi There!

I am a novice at creating interactive Forms in Acrobat. Now I created my first fillable form, mainly for the useful reason of being able to press enter to get to the next Text Box (safes having to use the mouse every single time..). But it doesn't work on mine. Pressing enter after putting some text in, just produces this annoying sound the computer makes when something doesn't work / or isn't allowed.

Can you help me? Am I missing something? (feel like I looked at loads of options already..)

Thank you!