Frozen rows stay visible at the top of a sheet while the rows below them scroll. Before, the scrolling rows were drawn over them. A dark line marks the edge of frozen rows and columns.
The selection outline, the cell being edited and formula reference outlines stay on frozen cells while the sheet scrolls. Outlines of other cells are hidden where they pass under frozen cells or headings. Moving to a cell with the keyboard scrolls it clear of the frozen rows. If a freeze cannot be saved, the sheet goes back to its saved frozen rows and columns.