Most printing in Alma is done using browser printing - just like printing a web page.
Circulation desk staff can view slips that they have previously printed and reprint them if necessary. See https://knowledge.exlibrisgroup.com/Alma/Product_Documentation/010Alma_Online_Help_(English)/050Administration/060Advanced_Tools/Printouts_Queue#Managing_the_Printout_Queue.
Hold slips will print automatically via a print daemon, similar to how they print with Aleph. More information on using the print daemon will be added when that is configured.