Is there a way to stop/ limit employees from canceling holidays without manager's approval?

Hello Sarah Bwalya

I don't believe there is the functionality in the system to be able to do this.
 
I'd advise posting this on our 'Ideas' part of the Customer Success Portal using the below link (you will need to be signed in):
 
https://help.hotschedules.com/hc/en-us/community/topics/360001928991-Ideas-WFM-UK
 
This will then be reviewed and further communication will be through your post on the Customer Success Portal.

Sarah Bwalya there is already an Idea on the CSP raised for this if you would like to vote and/or add further comments

Manager approval for cancelling holiday requests on ESS – Fourth & HotSchedules Customer Success Portal