Normally "Visit Pass" products are setup to be sold with a set of themes and languages permanently. However after several months some themes and languages are no longer available and are unavailable for sales.
Removing themes and languages from futur time slots can already be done at "Visit" space setup, but we simplified the process in this new release.
Modify futur themes/languages directly from Visit Pass product parametrization
The improvement implies re-using MODIFY themes/languages option (Visit space - Time slot) on Visit Pass parametrization screen (Timeslots menu)