Boundless theme product view

[louellaboutique]

Hello

I hope somebody here may be able to help, as I have searched everywhere and everything it seems!

I am currently using the boundless theme on my store and am looking to try and get my products to view in a grid style - for example 3/4 items per row and x rows on a page. Something like this...

 

Whilst mine are looking like this...

 

At the moment my products are displaying underneath each other in thin columns. I have changed the sizes of the images and styles but they never seem to end up in a grid style. Is there an app or code available to change my products to list in this way?

Any help would be very much appreciated!!
Thanks in advance