Keynote won't create multiple columns
I'm trying to create a 2-column text field in Keynote 12.1.
I have an existing text box with text in it. I want to change it from a normal text box to a 2-column text box.
I have followed all of the instructions carefully. (Sidebar => Format => Text => Layout => Columns)
The field for number of columns is empty. When I click on the up arrow, no numbers appear. I can manually enter "2" into the number of columns field, then press Tab to enter that number, and the text box doesn't change.
I have tried this on several different text boxes in a couple of different Keynote files. Same thing every time.
Help!!! I appreciate any input or advice.
MacBook Pro 16″, macOS 12.2