Would prefer the attached document icon (in inbox) to be in line with email not below. Therefore unifying the space of each email.
When there's an attachment (non-conversation view) the icon for the attachment is below the subject therefore making the row for the email twice as wide. Can this be in line with the subject, therefore unifying the width of each row?

v]Thank you for the feedback, and for trying Outlook on the Web.
I just wanted to let you know that there are two options to turn off those two features you mentioned.
1) Click on the Gear in the top right
2) Toggle off Attachment previews.
This should turn off both of those features you mentioned.
Hope this helps
David Los