In SharePoint Online we currently have standard lists that contain two or just one column using a customer view as a default. When we host the view on a subsite the columns do not retain any standards widths and in some cases in the .aspx file the width are not even being saved. Yes the user can resize the column width but on initial startup the lists are not retaining any changed widths. screen shot
Opened up the "All Items.aspx" file and our customer "KBQLink.aspx"