Is it possible to change font for multiple selected text boxes in Writer?

Using LibreOffice (from jessie-backports) in Debian 8.2 Jessie

I am trying to create a fillable PDF form, and I am using Form Controls for it. I need to modify the font sizes of some of the text boxes so they will print larger. I hold down shift and select each text box and when I try to change Font in the ‘Right-Click->Control’ dialog, even though I make sure I’ve clicked OK instead of Cancel, the Font field is unchanged, and indeed there is no difference between the old PDF form and the new one.

So is it even possible to change fonts for multiple text boxes at once, or do I have to do it one by one?

I’m afraid you have to do it one by one - creating forms is really annoying