Hi @jafar,
I’ve tested locally, but I was able to easily change the List/block element width. I suspect that there is a width value somewhere, that overrides this one.
But, if your coworker can change the same property, and it updates for him, then it may be something with your browser.
Since I can’t reproduce it, can you send temporary login credentials to your website and a link to this thread to help@bricksbuilder.io using the email address you used during the purchase, so we can take a look? And a link to the page, where I can test this one. You can also record a video, so I will know exactly what properties are not working for you.
Thanks,
Matej