Hi @LorenaS, Welcome to our Adobe Express community! Thanks for posting here.
Currently, the layers can only be expanded and dropped to a single tile, as you shared in the screenshot. Removing it is not an option available with Adobe Express, but you can let our product team know about this feature by posting a feature request here: https://adobe.ly/3Js9lAl;
Additionally, you can adjust the Zoom settings for the project to facilitate easy collaboration and utilize the available space.
Hope this helps!
Best!