I'm starting with the LaTex and I could not figure it out how can I change the size of the first column (dates). My dates are being broken, and I believe it has to do with those lines. As it follows below:
I assume you are using this document class by Roald87? It is better if you post a MWE (minimal working example) or at least the complete document.
In that case you need to edit this line:
With your desired column width. The class will recalculate the right column width to compensate: