Photoshop user interface - either too big or too small

when first started using program, interface size normal. in past week noticed interface size larger usual , hard use since many tools off page. found out how change user interface , set 100% small. auto , 200% same , large. auto, 100% , 200% 3 options see. there way reset interface normal?

in past week noticed interface size larger usual , hard use since many tools off page.

what else changed @ same time? did upgrade photoshop? operating system? change display resolution? did connect overhead display changed display resolution you?

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