D. Hoffmann wrote:
There is the possibility to check “Show Floating Thumbnails” in an “Options” pull-down menu, which comes up at the bottom of the screen after hitting ⌘⇧5. The question remains how that setting was changed by the minor macOS update.
I hate that little floating pop-up. I can not turn it off fast enough.
The 15.4.1 has repeatedly turned it back on, no matter how many time I get in the Options to tun it off.
for your issue— file a bug report / submit your Apple Feedback here: Product Feedback - Apple
this is not the first time a 'point update' has introduced bugs to this setting.
ref: Shift Command 5 —>Options make changes to suit your needs
Take screenshots or screen recordings on Mac - Apple Support
Shift Command 3
Shift Command 4
Take a screenshot on Mac - Apple Support