Try resetting your Photoshop preferences.
Thank you JJMack. Just gave that a try, but it did not solve the issue. It has to be a setting of some sort.
Well, for whatever reasonI had to reset Bridge's preferences. I discovered I couldn't open photos from Bridge. When I reset it's preferences (using ctrl when I opened it), then everything worked right again. Thankfully.
We are happy to announce the release of Photoshop CC 19.1.3 and have introduced the fix for Photoshop CC 2018 19.1: Photoshop opening images highly zoomed in unexpectedly | Photoshop Family Customer Community
See what's new in this release: Fixed issues in Adobe Photoshop CC
To update Photoshop CC to 19.1.3, click "Update" in the Creative Cloud desktop application next to Photoshop CC.
Well I checked that in newest 19.1.3 before your post and the problem still exists:
That linked by you topic refers to bug that occured in 19.1.0, not like this in 19.1.1