How can we put multiple boxes in one line?

Hi please advise how we can put 3 boxes in one line, please see screenshot

I've browsed your recently modified forms and found this form similar to the one on your screenshot. It seems though that you've already figured it out as I am seeing those 3 fields in one line.

If this is not the form you are referring to, can you please share to us the form URL? If you would want to apply the same formatting to another field, but forgot how to do it, you may checkout these related guides:

Form Field Positioning

Setup Form Columns