Expand list or library column width in SharePoint Online
In document libraries and lists, the column width is set to a default and may obscure file names or other item details. You can save a view in SharePoint after manually adjusting the column's width so that you can view the full text in the cells.
To adjust and save the column widths:
- Hover over the column's side and drag it to the appropriate width.
- Select All Documents* (right-hand side) > Save view as.
- You can save this as your existing view or rename it to create a new view. Select Save.
When this is done, you shouldn’t have to manually adjust the size of your columns anymore.