I want to make the sidebar wider in Mail and have it stay that way. I am not talking about the icon size or the font size but the actual width of the sidebar (so I can see the full name of my folders and mailboxes). I change it when I open a new window but every time I close and reopen it defaults to a ridiculously slim sidebar. Using High Sierra.
iMac, iOS 11.3
Well it would be normal behaviour for the system to remember the width of your sidebar columns and in my install of High Sierra it does this no problem. So the question is do you have any software installed that alters the behaviour of the Mac or Finder.
What sort of software would that be? I have Microsoft Office, Adobe Creative Suite, and others but not sure any of those would alter sidebar settings on my Mail app?
Generally if you expand the mail side bar column width and compose a new mail window ( command and N ) , compose a mail and send it , and quit the mail app the column size is saved until you manually change it .
To resolve it , enter in user library macOS Sierra: Library folder
Find a folder container > drag and drop a folder com.apple.mail to the desktop , restart the Mac and then open mail application .
This is a trial method if major issue is in the mail application delete the account and configure it once again Set up Mail on your Mac with email accounts - Apple Support
To find out what is cause of the issue use https://etrecheck.com/
And if interested post the results .
How do I make the Finder and Mail sidebar wider and have it stay that way?
