Timothy Stephens wrote:
I apologize if I'm missing something here... but if you just want them spread equally across a grid you can simply hover over that grid and click the icon that appears on the right side. When you hover over it you should see the tooltip saying "equalize the width of blocks in this grid". Clicking it will give all the blocks equal width (in this case for 3 of them it will assign 33.3% to them all).
Thank you Timothy, that worked perfectly!
I still don't know why typing it in manually doesn't work but I don't care, I'll just use this method in the future