When I log in on on Protonmail via Web Browser, my Inbox appear as if it can be sorted by columns with the headers being All, Read, and Unread.

Here is what I see when viewing this display:
-the first column shows a favicon or initials of the sender
-the second column is a star or unstar
-third column is DISPLAY NAME of Last Responder (if it was sent to me, then it shows the senders display name, a reply shows my own email address which is not helpful)
-fourth column we have the Subject Line and this extends to the final fifth column that sorts from newest or oldest first.

Hopefully that describes what you should be seeing at this point, because I can't submit screenshots here.

The issue stems from what seems to be that Protonmail APPEARS that it will allow you to interact and drag and resize these columns similar to an Excel file option, but it does not. All you can do is click anywhere on this subject header to open the email. The problem is now that i get an email from "SomeoneThatIMightKnow....." with Subject "Hi". In the example, the Sender's name of the email is being truncated to leave room for a long subject line.

As a security user, I want the inbox display most importantly to display the Sender's full name without being truncated, regardless of what the Subject might be. For another example, would you prefer to open an email when you see "JohnSm.. Hi How are You?" or an email from "JohnSmith@adomainirecognize.com Hi How Are.."

So I don't know how everything is coded, but my guess is that the email Subject line is being given priority over the Sender header, so ProtonMail on web is going to display the Subject over the sender, where as this is not a secure or intuitive option for the user.

Thank you. Please message me if you would like screenshots or followup.