Thanks for contacting Syncfusion support.
We have checked with the provided information. We are not able to reproduce the issue “the toolbar on top is hidden when SfSchedule is scrolled vertically” in our latest version 16.2.0.41. We have also checked with day/week/workweek view scrolling and month view (with vertical navigation direction). We have prepared a sample containing Coordinator layout with AppBarLayout (contains tool bar) and SfSchedule. If the provided sample does not meet your scenario, could you please modify the sample along with replication procedure and provide more information about the scenario? So that, it will be helpful for us to analyze and provide you better solution. Kindly find the sample below,
Regards
Vigneshkumar R