I want to adjust layout for some blocks to 3 columns.
Where i need to modify files to get this layout?
1.
2.
3.
add a screenshot where you want to have three columns

I want to change columns in different blocks in some modules.
Also, for future will be a great option if we can change this from panel.
+1
This would be good to have to make the most of the available viewing space.
We will take this idea into consideration when we change the template. Thanks a lot!
@paula-w Can you give me some ideas where i need to make changes?
Can you share your changes so there is a possibility of it being added as a theme or other user like me can use it?
I don't like the 2 column design either, certain field don't need half the column. Especially with the Checkbox one.
It will be awhile before I try my luck with modifying the file, hopefully v5.0 will include a Template or Layout moving.
Alternatively I suppose you can modifying it through CSS. @cristyxx
Most helpful comment
I want to change columns in different blocks in some modules.
Also, for future will be a great option if we can change this from panel.