For some users, Outlook's contact card is really wide, with the X to close it extending well of the side of the monitor.
The usual cause of oddly sized windows or windows that extend off the screen is because the screen resolution changed, often when using a laptop with an external monitor. Fortunately, it is easy to fix. The Contact card's height (and width) is stored in the registry, and you can either edit the Width value or delete it (Outlook will recreate the value if you delete it).
HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Common\ContactCard DWORD: Width Decimal value: 720
- Press Windows key + R to open the Run dialog, type regedit and press Enter.
- Browse the registry and locate HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Common\ContactCard
- Right-click on Width value (on the right) and select Modify (or Delete, and let Outlook recreate the value.)
- Select Decimal Base then type 720 in the Value Data field. (This is the default minimum width.)
- Click OK
- Close the registry editor
- Open a Contact card to check the size. If it's too small, you can adjust the card size in Outlook, by pulling the handle in the lower right corner.
To quickly find a registry key, copy and paste the registry path in the address bar at the top of the editor in Windows 10 or Windows 11 then press Enter to jump to it. You don't need "Computer\", just HKEY and what follows it.
If you prefer not to edit the registry yourself, you can download and run this reg file.
Contact Card Width @ 720