Open Update Date Sheet
Open General → Extras → Date Sheet → Edit.
Choose your layout
Classic opens first unless you save another default. Try the new layout and View old layout switch both ways. A layout in the page address takes priority for that visit. Failed default saves keep your previous choice and offer Retry. Switching on this page keeps its current inputs and page address. Other links keep their original destinations.
Original scope
Classes remain fixed on Update. Change the original name, title and subject-row fields. Turning off Time or Syllabus clears those values. Browser Print keeps the original form and subject rows. A layout switch retains the same sheet identifier and draft and does not save it.
Loading and recovery
The new layout disables data controls during required reads or Save. Failed reads hide stale values and offer Retry for the failed scope. The draft is retained while Save is pending; original subject-row identifiers and validation stay unchanged.