Hi,
I'd suggest you look in the user manual of phocagallery next time... it is quite extensive. The link is in the forum board (in the description of the forum: Components - PhocaGallery).
The number of columns is just a setting. Note that you have to change it in the component paramaters of the menu item. (menu >> your menu >> your phocagallery menu item >> component parameters = 2nd box on the right)
See for an explanation of all settings:
https://www.phoca.cz/documents/2-phoca-g ... -menu-item
I hope this make things clear (and I know for sure this question has been asked before in the forums - especially the phoca gallery forum)
Carolien
Please ask your support questions in the forums and not via PM - I delete those PM's
Backup before you do any major change to your website (and test first)