Similar to what Charlie said … I’ve done “related” screens where user can toggle (e.g. via F11) between screens. It feels like one screen to the user but actually uses different screens.
REGISTER or login:
A record cannot be more than 24 or 27 rows
PageDown/PageUp control functions could be used to display different pages .. in the RPG program.
The 50 Data fields could be put into a subfile which would allow page-up and page-down but all rows of the subfile whould have the same structure .. perhaps char 75. Doesn't seem to useful. Output would be reasonable, input control would be sketchy.