Hey @4991jack . I noticed this change to 2 columns on the Seller Hub Overview page several days ago on one account, while on another account there are still 3 columns. This change to make the window panes wider was made by eBay - my zoom % on my browsers has not changed.
I can get back 3 columns if I zoom out, but everything is, of course, smaller. So it's a trade off. You have to decide which is easier for you to live with - shrinking everything smaller than it was before or going with the new 2 wider column flow.
This appears to be an intentional design change by eBay. Either a test, or a phased rollout, which explains why not all accounts are seeing it.
Even my own accounts, I can look at 2 different accounts on the same browser with the same page zoom and resolution, and I see 2 different layouts (2 wide column on one account vs 3 standard column on the other account).
The account with the 2 column view is always opted in really early to Seller Hub and other types of changes. Sometimes I see these changes 6 mos before they roll out to the majority of sellers.
Not ruling out a glitch of some kind, of course. But since other seller hub format changes have been rolled out recently (most minor, some slight spacing changes, and other small things people may not even notice) that leads me to think this change is also intentional.
