Cannot Save Column Changes

I’m currently testing out the Make theme before buying and thus only have the free version. I’m using the Builder Template on a new page and have insert a column. I’m trying to change the number of columns from 3 to 1, however, when I do so the “Done” icon never appears at the top right for me to save my changes, only the “x”. When I click the “x” it just closes without saving, and I’m stuck at the default 3 columns again. The same happens of I try to add a background image or any changes.

According to the how-to videos a green “Done” button should appear at the top right, which I’m not seeing.

This seems to be a feature in the free version, is it not?

I’ve recreated the issue in both Firefox and Safari.

Any help appreciated, thanks!