Main Window - Edit | Untag Selected                    Alt +;

View Window - File | Thumbnail | Untag Thumbnail                    ;  or  Alt+;

Thumbnail Popup Menu - Thumbnail | Untag Selected

 

 

ThumbsPlus can tag selected files by placing associated thumbnails in a special gallery named (Tagged Images). To untag a group of files in the thumbnail view, select the desired thumbnails and press Alt+;. Open images are untagged by selecting File | Thumbnail | Untag Thumbnail from the view window menu or by pressing ; or Alt+;.