MacOS Photos app import window too wide

That's weird. Try these things to and see what happens:

• Restart the computer (of course)
• Re-start in Safe Mode. This bypasses certain potentially disruptive processes. Safe Mode is different for different computers, so see this: 

           Start up your Mac in safe mode - Apple Support 

Those are the easiest things to try. Then try these:

• Use another library if you have one, or make a small test Library with a few pictures in it and see if the same thing happens. You can create a new Library by closing Photos and then option-clicking on the Photos icon.
• Make a new user and see if the same problem recurs with it
• Rebuild your Photos Library--close Photos and re-launch by option-command-clicking the app icon.

The idea is to find out if the problem is with the Library, with your account, or with caches and login items, and stuff like that. One of these steps may fix the problem, but their failure to work also helps figure out what's happening.

NearlyLegal wrote: … (no matter what method is used).

It seems like you're telling us that there's no hope of our giving you a method that works! Are you sure you've tried every possible method? I wish you had let us know what you've tried. Did you click on the little green button

that makes the window the size of the screen? How about ⌘- that makes the thumbnails smaller? Can you grab the window at the top, like where the colored buttons are, and drag the window to the left?

If you've tried those and failed, let us know what else you've tried, and maybe we can thing of something new…

You're sure this isn't from the import pictures--it seems that it worked for the new Library with them, is that right Does this happen even if you import only one picture?

When I import pictures from my camera, I drag them directly from the SD card to an empty album I've created-- I usually don't go through the import process. If I import a single picture, I may just drag it to the Photos icon, and then I go to the Import "album" and drag it where I need it.

Corrupted image files can be a real problem-- it's usually videos, since they are less standardized. One possible way to find a corrupt file is to use a Smart Album with

It really doesn't catch much, but it's easy.

It might be worthwhile to try the trusted 3rd party app PowerPhotos ($30) to bring the original Pictures into a new Library. The free Trial version may do it.

Just thinking through things that I might do…